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The Hart Manufacturing Company; "Diamond H" Switches; Hartford, Conn., U.S.A.; Harry A. Hart, general manager; Gerald W. Hart, president; George H. Hart, vice president; branch offices New York, London; representatives in Toronto, Canada, Paris, France, Oslo, Norway, Osaka, Japan, Buenos Aires, S.A., Boston, Chicago, Dallas; Representatives in Philadelphia, Detroit, Cleveland, Buffalo, St. Louis, Minneapolis, Los Angeles, San Francisco, Louisville, New Orleans; Trade mark H; Letterhead contains image of the Hart Manufacturing Co. factory complex and logo consisting of letter H in a flattened diamond shape


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Letterheads, Manufacturing industry, Electric switchgear, Factories, Hartford (Conn.), Connecticut, New England