We estimate that this cast-iron boiler catalog from The Peerless Heater Company in Boyertown, PA is from the 1980s or 1990s.
Trane Mercury Seal Ad (1901)
This document contain an ad from Domestic Engineering (circa 1901) featuring the Trane Mercury Seal which was attached to an old steam heating system or to an old vapor plant of any type. The mercury seal was used to create vacuum within the heating system.
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