| 摘要 |
<p>Two switches (12,14) are operated in common by control devices, e.g. an emergency push button. These in turn control timer devices (24a,24b) the time being set according to which switch contact is closed. The timers initiate controllers (28a,28b) which trip power supply switches (30a,30b). All are housed in a common cabinet (36) with the switches arranged in one plane</p> |
