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ID = 77924
United States of America (USA)
Brand: Clare, C.P. & Company; Chicago, IL
Tube type:  Relay in glass (not Relay Triode) 
Identical to EM-4


Mercury displacement contactor, DPST.

Mercury displacement and mercury wetted relays were sometimes used as high-speed pulse generators due to their unique feature of making and breaking circuits in very few tens of picoseconds with no bouncing.

EM-4: Private collection
Emilio Ciardiello


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