Inside Out Library · Explore

Reliable vacuum and vacu-vapor heating equipment (1915)

The Bishop-Babcock-Becker Co. · The Bishop-Babcock-Becker Co. · leaf 62

Heating units · Vacuum-tube collectors · HVAC ducts and casings

Internet Archive · Building Technology Heritage Library · Public Domain Mark 1.0. Free to use for anything.

More pictures from Reliable vacuum and vacu-vapor heating equipment

More like this