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Old February 17, 2013, 12:16 PM   #2
Senior Member
Join Date: September 19, 2008
Posts: 4,678
Since less than 1,00 were made, and not many survived, they're pretty rare (and desireable to collector's) - So, I'd only give it a superficial wipedown with an oily cloth, if it were mine.

FWIW, here's the patent drawing:

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