Abstract: An impeller includes a hub and a plurality of blades. The blades are arranged around the hub, and each blade includes a leading edge, a blade tip, a root portion, a trailing edge, a windward side and a leeward side. The windward side including a first turning point and a second turning point, a first vertical height difference is formed from the blade tip to the first turning point, and a second vertical height difference is formed from the first turning point to the second turning point, and the first vertical height difference is greater than the second vertical height difference. The impeller apparently reduces the noise.

Abstract: A handsfree mobile telephone rack for holding any of a variety of mobile telephones permitting a user to send a message by a mobile telephone with both hands free, comprising a power socket connected to a power supply by a power cord, a power switch, a volume control, and two loudspeaker circuits, wherein the two loudspeaker circuits each comprised a microphone and a loudspeaker with the output volume thereof regulated by the volume control; the two loudspeaker circuits include one for transmitting the sound waves from a user to the mouthpiece of the mobile telephone mounted thereon and the other for transmitting the sound waves from the receiver of the mobile telephone into the air.

Abstract: A gas candle, comprising a cylindrical casing divided by a division plate into a first chamber at the bottom for containing illuminating gas and a second chamber at the top for holding a gas flow rate control device. The division plate has a gas outlet hole at the center through which illuminating gas is permitted to discharge into the second chamber. The gas flow rate control device has an outer thread screwed up with the inner thread on the second chamber, a nozzle tip defining a gas passage way longitudinally piercing through the body of the gas flow rate control device, an annular groove on the periphery thereof at a lower end with an O-ring mounted thereon to seal the gap between the gas flow rate control device and the cylindrical casing. A sealing cover is mounted on the division plate at the top to seal the gas outlet hole. A pressure cushion is mounted on the seal cover at the top, having a pin at the top for inserting in the gas passage way of the gas flow rate regulating device from the bottom.

Abstract: The present invention relates to a novel lighted inflatable ball having a novel structural design to enable the inflatable ball to be lighted at night for recreation. A hollow compartment of soft PVC membrane is centrally provided in an inflatable ball. One end of the hollow compartment is closed and the other end closable by a closure. A battery cell holder with switch is insertable in the hollow compartment. Wiring from the cell holder passes through the soft membrane layer by means of a blockading member in which the wiring is airtightly fused. The cell wiring is connected to bulb wiring of a plurality of bulbs fixed in projecting rings molded on outer sides of the hollow compartment.