Signals and indicators – Indicators – Liquid level
Patent
1980-09-18
1982-07-20
Smith, Robert I.
Signals and indicators
Indicators
Liquid level
145 37, G01F 2300
Patent
active
043400094
ABSTRACT:
An open-top, generally cylindrical housing including a bottom plate is droppable down the fill tube of an underground tank. A striking plate is resiliently supported in the housing by a coil spring or other resilient member.
REFERENCES:
patent: 2690155 (1954-09-01), Cary
Hudgens Ronald C.
Owens-Corning Fiberglas Corporation
Rose Paul J.
Smith Robert I.
Wetmore Kenneth H.
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