optical fiber
01:18:09
spark gap
01:18:08
optical fiber lightguide
01:17:57
closed-circuit working
01:17:06
active
01:16:55
signal conditioning
01:16:42
closed position (mechanical switch)
01:16:41
dockable
01:13:56
full wave rectifier
01:12:37
emissivity
01:12:29
down arrow
01:10:40
communucation network