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Filter: Subject of Heating and ventilation industry
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| Description: | Letterhead of National Blower Works of Milwaukee, Wisconsin, manufacturers of "Steam Hot Blast Apparatus." On the left is an Uncle Sam figure pointing to a... |
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| Description: | Letterhead of the Pennsylvania Coal & Supply Company, with the company trademark: the initials "P" and "C" printed in red ink, and a head and shoulders ima... |
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