|
US3410485A
|
|
Temperature and vacuum responsive control valve
|
|
US3326202A
|
|
Atmospheric type water heating apparatus
|
|
US3331366A
|
|
Vertical direct-fired water heater
|
|
US3291119A
|
|
Direct-fired water heating apparatus
|
|
US3112876A
|
|
Two-stage valve having floating switches
|
|
US3105541A
|
|
Gas burner construction
|
|
US3034532A
|
|
By-pass valve unit
|
|
US3051432A
|
|
Two-stage hydromotor-operated valve
|
|
US2973935A
|
|
Two-stage single diaphragm valve
|
|
US2912535A
|
|
Temperature and earthquake responsive electric switch
|
|
US2873753A
|
|
Temperature and earthquake responsive safety cut-off valve
|
|
US2966329A
|
|
Adjustable gas control valve
|
|
US2946341A
|
|
Unidirectional check valve
|
|
US2849587A
|
|
Electrical safety control apparatus
|
|
US2821613A
|
|
Electrical safety control apparatus
|
|
US2881787A
|
|
Safety control valve
|
|
US2812770A
|
|
Safety cut-off valve
|
|
US2825510A
|
|
Adjustable gas control valve
|
|
US2778917A
|
|
Electrical safety control apparatus
|
|
US2701580A
|
|
High and low pressure safety cutoff valve
|
