(KY-116/U) - Clip-On-The-Leg straight key
consisting of a standard J-37 key screwed to a black painted
steel plate which was hinged to a large clip. The clip was
made to comfortably fit around the thigh of a seated radio
operator. Key mounting was easily reversed for use of J-45
on a table as well.
primarily in tanks and aircrafts. "J-45" was
original designation of this model. After 1943 when "AN System" was approved,
the J-45 keys got their new designation of KY-116/U.