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Fri, 13 October 2017 15:25

hancock4
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Registered: December 2011

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Western Union used 75,000 "D" flashlight batteries; and 75,000 No. 6
dry cells in various applications, mostly in self-winding clocks.

WU Labs tested dry cells every year to determine which kind would
provide the most dependable and economical service.

The testing process is described here:
http://massis.lcs.mit.edu/telecom-archives/archives/technica l/western-union-tech-review/09-2/p062.htm

Another article describes the engineering necessary to install
line poles.

http://massis.lcs.mit.edu/telecom-archives/archives/technica l/western-union-tech-review/09-1/p024.htm

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