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Reliable vacuum and vacu-vapor heating equipment (1915)
The Bishop-Babcock-Becker Co. · The Bishop-Babcock-Becker Co. · leaf 34
P-i w Thirty VACUUM HEATING EQUIPMENT … B .5* 3 cr- a 3 aa O> I 3 M ! I I I I I J I II 3 M w < 5 © T3O ^3 Thirty-One THE RELIABLE AIR LINE RELIABLE DUPLEX AIR LINEELECTRIC VACUUM PUMPINSTALLATIONHeating units · Vacuum-tube collectors · HVAC ducts and casings
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