These controllers drove two polarized relays, which switched up until the requested step was reached.
2.
Such polarized relays are used on direct-current circuits to detect, for example, reverse current into a generator.
3.
Shockley hoped that the new device will replace the polarized relay in telephone exchange; however, the reliability of Shockley diodes was unacceptably low, and his company went into decline.
मोबाइल