Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Vento Cast Iron Heaters
This is an excerpt from The Ideal Fitter, which the American Radiator Company published yearly back in the day. It features the Vento Cast Iron Heater. It reads, "Just as American Peerless Radiators have become the standard for direct radiator heating, so also has the Vento Cast Iron Hot Blast Heater become the standard of merit for blower and ventilation systems."
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Perfex Series 155 Magic Dial Thermostat
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