Circuit elements having no moving parts: for process regulation

Official title: {for process regulation, (e.g. chemical processes, in boilers or the like); for machine tool control (e.g. sewing machines, automatic washing machines); for liquid level control; for controlling various mechanisms; for alarm circuits; for AC-DC transducers for control purposes (special provisions on lathes B23B25/00, B23Q; electric regulation of mechanical working machines B23Q35/00, G05B19/00; thread feeding devices for sewing machines D05B51/00; automatic washing machines D06F33/00; valve-controlled servomotors F15B9/08; non-electric signal transmission G08C23/00)}

F15C1/003 (Circuit elements having no moving parts: for process regulation) appears on 7 US grants and 5 published applications in this corpus.