1853   Frick Company
         1855   B F Sturtevant
         1863   Otis Elevator
         1867   Vilter Manufacturing
        1874   York Ice Machinery Corp
        1878   Buffalo Forge
        1885   Honeywell
        1885   Johnson Controls
        1886   Trane
        1890   Powers Regulator

        1892   American Radiator  
        1895   Lennox       

        1899   Carbondale Machine Co
        1907   Carrier AC of America
        1915   Carrier Corp
                   Other Manufacturers