Sylphon Trademarks

SYLPHON
HOLLOW EXPANSIBLE AND CONTRACTIBLE CORRUGATED TUBULAR DEVICE
Expired  ·  March 2, 1915  ·  71084882  · 
SYLPHON
HEAT REGULATORS FOR USE ON BOILERS, FURNACES, AND STOVES
Expired  ·  October 18, 1905  ·  71013722  · 
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