http://atomictoasters.com/wp-content/uploads/2012/12/XB-39-Engineers-Station.jpg
An internal search of the Boeing website turned up nothing. Google search of 77B112 Lewis turned up electrical temp gauge.
Looks to be from the era of B-17, B-29, etc....Picture above is a B-39. Looks close.
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Rex
1975 911s and 2012 Range Rover Sport HSE
1995 BMW R1100RS, 1948 Harley FL
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