Set 502

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2923. 10" long:

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2924. 100' long, take a look at Neatorama for more guesses and a chance to win one of their funny T-shirts.

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2925. Approximately 2-1/2" long:

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2926. 12" long:





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2927. About 6-1/2" long:





































2928. Around 30" long:

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Answers:




2923. A Selectron Semimatic slide changing device for a projector, patent number 2,590,492:

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2924. This is the switch matrix for the old Voice of America towers that were located next to I-75 just north of Cincinnati, Ohio. It's basically a giant switch box for the antennas.

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2925. This is most likely for cutting the insulation on cable:

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2926. An AJC Adjustable "Speed" Roofing Hatchet





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2927. This is probably a can piercer:





































2928. A spoke tenoning machine, similar to patents 622,794 and 640,895, it's missing the hollow auger that would have been mounted onto the end of the crank shaft. The hollow auger would have been adjusted to cut a tenon of the correct diameter.

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More discussion and comments on these photos can be found at the newsgroup rec.puzzles.