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Hi! I posted a few weeks back, but have received no replies so I thought I'd try again. Trying to identify this object that was found in a Souther California junk yard in the 1980's but I believe dates back to around WWII. It's some sort of communication device shell or case? The words "tone" and "voice" are cast in it. Any ideas, suggestions or guesses would be helpful. I've asked several military museums and some professors of technology at different colleges, no one has any clue. Thanks for you help!