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Infrared Light Emitting Diode (emitter) in a metal TO-18 case used on Bally/Midway A080-1895-B000 transmitter Opto board.
Reference:
MLED930
NTE3028 equivalent (NTE emitters are polarized opposite from the original part. To use the NTE replacement, mount with the metal tab in opposite position to what is printed on the circuit board)
MLED930
E-587-27
010168750
5980010168750 (receiver part of an old drop sensor (the emitter is a BPW20 photodiode)