The hand-held T-17 microphone was commonly used by tank commanders, as their hands were more free during combat operations than drivers, gunners, or loaders. The T-17 was most commonly manufactured by Shure Brothers Company, and contained a built-in SW-109 push-to-talk switch. The T-17 had a hook on its top to enable the microphone to by hung on the turret wall when not in use. Because the microphone contained a built-in talk switch, the unit plugged directly into the BC-606 intercom control box and did not have to pass through the SW-141 push-to-talk switch that was used with the T-30 throat microphone or T-45 lip microphone. Tank usage of the T-17 favored the black bakelite case over the metal case, because it stayed cooler and more comfortable to hold inside a hot tank (internal tank temperatures could reach 130 degrees in desert operations). The T-17-B became the most widely used microphone in the U.S. Army and Navy.
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