Infiltrometer

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Volume – flow or rate

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D24 99

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D02739461

REFERENCES:
patent: D245486 (1977-08-01), Niskin
patent: D261739 (1981-11-01), Leibson
patent: 2862657 (1958-12-01), Copeland et al.
patent: 2862657 (1958-12-01), Copeland et al.
patent: 4055074 (1977-10-01), Thimons et al.
patent: 4114424 (1978-09-01), Johnson
patent: 4114424 (1978-09-01), Johnson
patent: 4364261 (1982-12-01), Askwith
National Geographic Magazine, "Special Report in the Public Interest-Energy, Feb. 1981, pp. 48 and 49.

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