Abstract: A method and system provide for yield loss analysis for use in determining the killer stage in the manufacture of a semiconductor wafer at a plurality of manufacturing stages. The method comprising the following steps. Inspect semiconductor devices on the wafer visually to identify the location of visual defects on dies being manufactured on the wafer and to maintain a count of visual defects on the dies by location. Inspect the semiconductor dies on the wafer to determine the location and number defective dies on the wafer at each of the manufacturing stages. Calculate the defective die count for each stage for the wafer. Calculate the defective bad die count for each stage for the wafer. Determine the percentage of the defective bad die count divided by the defective die count. Plot the trend of the percentage of yield loss and the percentage of defective bad dies for each of the manufacturing stages.

Abstract: A suitcase carrier has a positioning seat, an extension seat, a pair of extension arm plates, and two cover plates. The positioning seat has a chamber to receive the extension seat, a pair of channels, and a pair of inner threaded posts. Each extension arm plate has a first hollow column inserted in the corresponding channel and a second hollow column inserted in the extension seat. Each cover plate is disposed on the corresponding first hollow column.

Abstract: A wheel device has a fixed seat, a wheel support seat disposed in the fixed seat, and a wheel inserted in the wheel support seat. The wheel has a center hole. The fixed seat has a convex housing. The wheel support seat has a hollow interior, two opposite oblong holes, and two opposite enlarged holes. Two springs are inserted in the oblong holes of the wheel support seat. A shaft passes through the enlarged holes of the wheel support seat and the center hole of the wheel. A bolt fastens the wheel support seat and the fixed seat together.

Abstract: A retractable handle assembly has a grip device, a push button, a U-shaped rod, a driven rod, an inner pipe, a middle pipe, an outer pipe, an upper seat, a lower seat, and a first and a second positioning devices. The upper seat has two downward sleeves and two oblong apertures. The lower seat has two upward sleeves and two oblong holes. The push button encloses a center portion of the U-shaped rod. The grip device has a first grip casing and a second grip casing. The U-shaped rod is disposed in the grip device. The U-shaped rod has two end portions. An upper end of the driven rod engages with the respective end portion of the U-shaped rod. The driven rod is inserted in the inner pipe. The inner pipe is inserted in the outer pipe. The first positioning device is disposed on a bottom of the inner pipe. The second positioning device is disposed on a bottom of the middle pipe.

Abstract: A wheel support device has a triangular longitudinal casing, a triangular transverse casing, a convex housing, and a colored triangular plate. The convex housing has a through hole. The triangular longitudinal casing has a groove, a circular hole, and two round apertures. The colored triangular plate is inserted in the groove of the triangular longitudinal casing. The colored triangular plate has a post inserted in the circular hole of the triangular longitudinal casing and two columns inserted in the round apertures of the triangular longitudinal casing.

Abstract: A retractable handle assembly has a grip device, a button, a U-shaped rod, a hollow driven rod, an inner pipe, an outer pipe, a seat, and a positioning mechanism. The seat has two sleeves and two oblong holes. The grip device has a first grip casing and a second grip casing. An upper end of the hollow driven rod receives an end portion of the U-shaped rod. The hollow driven rod is inserted in the inner pipe. The inner pipe is inserted in the outer pipe. An upper end of the inner pipe is inserted in a lower groove of the first grip casing. An upper end of the outer pipe is inserted in a sleeve of the seat. The positioning mechanism is disposed on a bottom of the inner pipe.

Abstract: A wheel device has a wheel support seat, a wheel inserted in the wheel support seat, and a fixed seat engaging with the wheel support seat. The wheel support seat has a convex housing, two outer positioning plates, two inner guide grooves, two click blocks, and an upper positioning bar. Each outer positioning plate has a through aperture. The fixed seat has a convex portion, a step plate, a recess, an inner notch, an oblong groove, and two click holes. The click blocks are inserted in the click holes. The upper positioning bar is inserted in the oblong groove. A rivet passes through the through aperture and the center hole.

Abstract: A method and system provide for yield loss analysis for use in determining the killer stage in the manufacture of a semiconductor wafer at a plurality of manufacturing stages. The method comprising the following steps. Inspect semiconductor devices on the wafer visually to identify the location of visual defects on dies being manufactured on the wafer and to maintain a count of visual defects on the dies by location. Inspect the semiconductor dies on the wafer to determine the location and number defective dies on the wafer at each of the manufacturing stages. Calculate the defective die count for each stage for the wafer. Calculate the defective bad die count for each stage for the wafer. Determine the percentage of the defective bad die count divided by the defective die count. Plot the trend of the percentage of yield loss and the percentage of defective bad dies for each of the manufacturing stages.

Abstract: A rotatable drawbar device has a main seat, a rotating seat, a control device, a ring device, a handle bar, an outer pipe, and an inner pipe. The main seat has an opening, an upper flange, an oblong recess, a circular hole, two oblong holes, a rectangular hole, a T-shaped block, and two axle holes. A push button is inserted in the oblong recess. A block seat is inserted in the rectangular hole. A cover panel covers the block seat. The rotating seat is inserted in the opening. A pivot pin fastens the main seat and the rotating seat. The block seat has a T-shaped recess, two lateral bevels, and two oblong recesses receiving two coiled springs. The handle bar has a neck portion, a hollow interior, two confining plates, and a receiving recess receiving the ring device. The inner pipe is inserted in the outer pipe. An upper end of the inner pipe is inserted in the neck portion. The control device is inserted in the inner pipe.

Abstract: A handcart has a handle, two inner pipes connected to the handle, a movable seat having a downward groove, an opening, two rail plates, two lateral through holes, two lateral recesses, two upper sleeves each receiving the respective inner pipe, two lower sleeves each connected to the respective upper sleeve, two outer pipes each inserted in the respective lower sleeve and receiving the respective inner pipe, and a lower seat having two lateral sleeves receiving two lower ends of the outer pipes. The lower seat has an upward groove. A press button has a downward protruded block with two flat laterals and two lateral flanges. A cover plate has two lateral protrusions. A hollow block has a notch, a post, an inclined face, and a rod. A positioning plate has a slant, a pillar, and a bar. The press button is inserted in the opening and disposed between the rail plates. The rail plates block the lateral flanges. The positioning plate is inserted in the notch. A spring is disposed between the post and the pillar.

Abstract: An extensible handle device has a wheel support seat, a positioning seat, two outer pipes inserted in the wheel support seat and the positioning seat, two inner pipes inserted in the outer pipes, two base seats inserted in the inner pipes, two U-shaped slide seats inserted in the base seats, two drive blocks disposed on the base seats, a grip, a press button disposed in the grip, two hollow arm bars connected to the press button, a protruded bar disposed on a bottom of the press button, and two rods inserted in the hollow arm bars and the drive blocks. A coiled spring surrounds the drive block. The protruded bar is surrounded by a compression spring.

Abstract: An adjustable handle device comprises a first handle, a second handle, a first and second inner pipes, and a first end second outer pipes. The first handle has a first and second hollow arms disposed at two opposite ends of the first handle. The first and second outer pipes are positioned in a suitcase. Two inner pipes are inserted in the corresponding outer pipes. The second handle is disposed under the first handle. Two driven rods are inserted in the corresponding inner pipes. The upper ends of each drive rod are inserted in the corresponding recess holes of the first handle.

Abstract: A hand truck for carrying luggage having two wheel holders slidably fastened to a base frame thereof at two opposite ends and locked in position by a respective lock pin. The base frame has a longitudinal through hole through two opposite ends thereof, and two series of pin holes longitudinally spaced near the two opposite ends and respectively perpendicularly communicated with the longitudinal through hole. Each wheel holder comprises a bearing plate provided with a wheel at the bottom, a mounting rod horizontally extended from the bearing plate at one side and slidably inserted into the longitudinal through hole on the base frame and releasably locked in position by a respective lock pin being inserted into either pin hole at either end of the base frame, the mounting rod having a longitudinal series of pin holes for alternatively connecting to either pin holes at either end of the base frame by the respective lock pin.