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December 21, 1926 Trademark Filings
PROTECTOSTAT
THERMALLY-OPERATED ELECTRIC CUT-OUT SWITCHES USED AS SAFETY CONTROL FOR HEATING PLANTS
Expired
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December 21, 1926
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71241782
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PYROSTAT
TEMPERATURE-OPERATED ELECTRIC STACK SWITCHES FOR THE AUTOMATIC SAFETY CONTROL OF OIL HEATING PLANTS
Cancelled
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December 21, 1926
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71241781
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PROTECTORELAY
UNITARY AUTOMATIC ELECTRIC SWITCH SYSTEMS FOR HEAT REGULATION AND SAFETY CONTROL OF HEATING PLANTS
Registered
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December 21, 1926
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71241780
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