Originally posted by jerryd
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Are you sure all these are after 1930? I think the ones with the lens mounted outside the housing at the front might be the 1930s but I think the ones behind it are earlier.
Maybe I am confusing everything with what Police had in the World's Columbian Exposition of 1893 when H.H.Holmes was active.
If it's 1930 as you say then obviously they can't have had battery power lamps.
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