US3485100A
(en )
1969-12-23
Liquid-level measuring equipment
US2328853A
(en )
1943-09-07
Device for indicating the concentration, density, and dilution of liquids and solutions
US2702476A
(en )
1955-02-22
Apparatus for measuring liquid level
US2025534A
(en )
1935-12-24
Electromotive thermometry
US2625043A
(en )
1953-01-13
Measuring the average temperature of liquid in storage tanks
US4000651A
(en )
1977-01-04
Liquid level indicator
US1504978A
(en )
1924-08-12
Liquid-level indicator
NO121694B
(fa )
1971-03-29
EP0039420A3
(en )
1983-02-09
Length and temperature measuring device for tanks
US2516452A
(en )
1950-07-25
Liquid level indicating device
US1208026A
(en )
1916-12-12
Telemetric system.
US2213485A
(en )
1940-09-03
Liquid level indicator
US3805613A
(en )
1974-04-23
Liquid level indicator
US2292425A
(en )
1942-08-11
Rheostat
US2405689A
(en )
1946-08-13
Plural transmission means for electrical telemetric systems
US2495416A
(en )
1950-01-24
Liquid level indicator
US1049952A
(en )
1913-01-07
Water-level-indicating system.
US3713224A
(en )
1973-01-30
Apparatus for indicating the volume of material in a vessel or tank
US1432346A
(en )
1922-10-17
Electrical indicator
US2574432A
(en )
1951-11-06
Instrument for measuring or indicating the specific gravity of liquids
US2610275A
(en )
1952-09-09
Humidity selector switch
US3972235A
(en )
1976-08-03
System for determining the amount of liquid in a tank or series of tanks
US1641491A
(en )
1927-09-06
Rheostat for liquid-level indicators
US766811A
(en )
1904-08-09
Portable automatic boat-leak detector.
US2104898A
(en )
1938-01-11
Electrically controlled liquid level indicator