While harmless in itself, the light relay would set a bad precedent, they say.

In response the light relay has been modified.

Take, for example, the Einstein light relay.

Specifically, Losev patented the "Light Relay" and foresaw its use in telecommunications.

The Lamar Alternator Failure Warning Light Relays (Lamar Part No 00258, Piper number 587863) had catastrophically failed in that they had caught fire.

Ross was credited with being the first to find measures to combat "trench foot" and the effects of mustard gas, as well as being the first to use light relays to evacuate the wounded.