Stevens, Davis, Miller & Mosher
Switching apparatus
 There are provided a first switch which is switched to the on state or the off state in association with a displacement of an actuator which causes a displacement by a contact with an object and a second switch which is switched to the on state or off state later than the first switch in association with the displacement of the actuator. A switch output is produced and an abnormality is detected in accordance with the on and off states of these switches. 
Omron Tateisi Electronics Co.
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G08B H01H H01H H01H H01H
inventional additional additional additional inventional
Masanori Norio Hiroyuki Keisuke
Ishii Iwakiri Yamada Konishi