Abstract: An RF testing method is applied between a testing instrument and multiple devices under test at least including a first DUT and a second DUT. The testing instrument includes a signal generator and a signal analyzer. A sync signal is sent to the testing instrument and the first DUT, so that the first DUT occupies the signal generator to receive a testing signal from the signal generator. The first DUT sends an uplink signal to the signal analyzer based on the testing signal to occupy the signal analyzer for signal analysis at a first point in time. The sync signal is sent to the testing instrument and the second DUT, so that the second DUT occupies the signal generator to receive the testing signal from the signal generator at a second point in time. The first point in time is parallel to the second point in time.

Abstract: A spike strip for disabling vehicle tires is disclosed which is formed from a scissor arm assembly of a plurality of arms engaged at pivots. Moveably from a collapsed position to an elongated position the assembly has a plurality of spikes engaged thereon for puncturing vehicle tires. The spikes can be removed and replaced and can be formed into spike nets by an engaged cable.

Abstract: A test machine for testing a printed circuit board (PCB) (50) includes a base box (10), a top test device (70), a raising board (41), and a control system. The top test device is pivotably secured to the base box, for testing the PCB. The raising board carries the PCB to be tested, and is upliftably secured on the base box. The control system controls lifting of the raising board up, thereby connecting the PCB with the top test device during testing.

Abstract: A test machine for testing a printed circuit board (PCB) (50) includes a base box (10), a top test device (70), a raising board (41), and a control system. The top test device is pivotably secured to the base box, for testing the PCB. The raising board carries the PCB to be tested, and is upliftably secured on the base box. The control system controls lifting of the raising board up, thereby connecting the PCB with the top test device during testing.

Abstract: An auto stacking machine includes a worktable (10), a plurality of chutes (20), a pair of receivers (30), and a cushioning apparatus. Three vertical plates (14) are mounted on the worktable. The chutes are attached to outmost ones of the vertical plates respectively, for receiving slot covers (60). The cushioning apparatus includes a plurality of resilient members (55) positioned behind corresponding slideways, for cushioning the dropping strip articles. Each receiver includes a number of receiving spaces, for receiving and stacking the strip articles therein. The receivers are attached to the worktable, and are horizontally moveable. A controller is arranged under the worktable, for electrically controlling movement of the receivers to switch positions of the receiving spaces.

Abstract: A releasable slide fastener closure is formed by a pair of stringers with elements that interlock when in cooperating closed position and a slider mounted on the stringers for sliding movement along said stringers to move the elements into said interlocking closed position on movement in of the slider away from a first end and toward a second or closed end. Each of the stringers has a stop for preventing said slider from separating there from at each of its ends and the stringers are free to separate from closed position at the first end when a force is applied in a predefined direction adjacent to the first end.

Abstract: An auto stacking machine includes a worktable (10), a plurality of chutes (20), a pair of receivers (30), and a cushioning apparatus. Three vertical plates (14) are mounted on the worktable. The chutes are attached to outmost ones of the vertical plates respectively, for receiving slot covers (60). The cushioning apparatus includes a plurality of resilient members (55) positioned behind corresponding slideways, for cushioning the dropping strip articles. Each receiver includes a number of receiving spaces, for receiving and stacking the strip articles therein. The receivers are attached to the worktable, and are horizontally moveable. A controller is arranged under the worktable, for electrically controlling movement of the receivers to switch positions of the receiving spaces.

Abstract: A photoresist stripper bath includes a filter in a re-circulation line for filtering residual photoresist materials from said bath. The quality of the stripper and the concentration of the photoresist materials are sensed by passing infrared light transversely through the re-circulating line, detecting the intensity of the light passed through the line and comparing the detected level with a threshold value related to the concentration of the photoresist materials in said stripper.