|
US2031018A
|
|
Viscosity regulator
|
|
US1981530A
|
|
Level regulator for viscous liquids
|
|
US1931274A
|
|
Constant reading depth indicator and flow valve therefor
|
|
US1832266A
|
|
Check valve for column indicators
|
|
GB181005A
|
|
Reading indicators for manometers
|
|
US1519609A
|
|
Specific-gravity meter
|
|
US1605014A
|
|
Reading indicator for manometers
|
|
US1466359A
|
|
Gauge
|
|
US1523110A
|
|
Liquid-level gauge
|
|
US1579415A
|
|
Fluid-pressure recorder
|
|
GB150699A
|
|
Water level indicator instrument
|
|
GB144623A
|
|
Improvements in traps for manometer tubes
|
|
US1421739A
|
|
Manometer
|
|
US1379716A
|
|
Water-level-indicator instrument
|
|
US1457406A
|
|
Depth and specific-gravity measuring apparatus
|
|
US1354023A
|
|
Trap for manometer-tubes
|
|
US1421711A
|
|
Distant boiler-water-level indicator
|
|
US1131412A
|
|
Pneumatic depth-indicator.
|
|
CA229601A
|
|
Reading indicator for manometers
|
