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BK-TELE TELEPHONES & MICROPHONES. You get details on building simple telephones. And that in itself is an interesting little experiment in electricity, metal working, and woodworking. Also, get the details of building carbon mics, and magnetic earphones. You get details on wiring them up into working telephone system with batteries, bells, ringing key, induction coil and more. If you're looking for a science project or want to build your own radio equipment, or even build a replica of an early telephone. 80 pages.


 
Quantity   Price
1 or more   $7.95 each



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