December 21, 1926 Trademarks
PROTECTORELAY
Filed: December 21, 1926
UNITARY AUTOMATIC ELECTRIC SWITCH SYSTEMS FOR HEAT REGULATION AND SAFETY CONTROL OF HEATING PLANTS
Owned by: ADEMCO INC.
Serial Number: 71241780
PYROSTAT
Filed: December 21, 1926
TEMPERATURE-OPERATED ELECTRIC STACK SWITCHES FOR THE AUTOMATIC SAFETY CONTROL OF OIL HEATING PLANTS
Owned by: Honeywell Inc.
Serial Number: 71241781
PROTECTOSTAT
Filed: December 21, 1926
THERMALLY-OPERATED ELECTRIC CUT-OUT SWITCHES USED AS SAFETY CONTROL FOR HEATING PLANTS
Serial Number: 71241782
