Abstract: A device for holding a plurality of toothed blades of flanked keys that may be selected and pulled out one by one. Each key has a groove with a preferably triangular section along the whole length of the edge resting against the bottom of the device for sliding along ribs of equal sections on the bottom of the device.

Abstract: A tray for storing a semiconductor device such as a BGA device. This tray comprises a storage portion for receiving and storing the BGA device therein. The storage portion has a wall surface which is arranged around the semiconductor device upon storing the semiconductor device. This wall surface has an area which is inclined with an angle so as to support an edge of a package of the semiconductor device but not to come into contact with wiring terminals thereof. With this arrangement, the inclined are comes into contact with only the edge of the package so as to be able to support the package.