Abstract: A microwave oven has a switch mechanism for selecting first and second cooking functions and activating/deactivating a magnetron of the microwave oven. The switch mechanism comprises first and second rotary switches actuable by respective coaxial knobs for generating encoded signals to establish the first and second cooking functions, respectively. One of the knobs can be pushed axially to activate/deactivate the magnetron.

Abstract: An apparatus for testing plug-in type integrated circuits by applying a potential across their input and output terminals, utilizing a socket board with a plurality of sockets bored therein to receive respective input and output terminals of an integrated circuit. A pair of first and second groups of fixed contacts are located in the socket board, arranged in two concentric circles enclosing the sockets. Each fixed contact in each group is individually connected to one of the sockets through a conductor. A pair of coaxial first and second moving contact pins is rotatably disposed below the socket board. The first contact pin rotates to follow the first circle while sequentially contacting the contacts of the first group. The second contact pin follows the second circle, making sequential contact with the fixed contacts of the second group.