Butterfly air control valve

Details Butterfly air control valve Butterfly air control valve

1993-10-21

1995-05-09

Seifert, Ralf T.

Machines not elsewhere specified

Engine

Element or attachment

Patent

active

D03581560

REFERENCES:
patent: 44726 (1913-10-01), Kelly
patent: D222599 (1971-11-01), Waiand
patent: D250658 (1978-12-01), Fetty
patent: 2966169 (1960-12-01), Reece
patent: 4822001 (1989-04-01), Sisk
patent: 4981284 (1991-01-01), Imamura et al.

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