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Lichtschranke f =, -n
gen.	photoelectric barrier; photoelectric beam
chem.	light barrier
construct.	photoelectric sensor
el.	photoelectric relay
meas.inst.	light switch
mech.eng., el.	photo-electric guard
phys.	light relay; photorelay; photoswitch
tech.	photosensor
textile	light barrier (photocell)
weap.	screen

Lichtschranke: 2 phrases in 2 subjects

Construction	1
Electronics	1