Duct close elbow

Details Duct close elbow Duct close elbow

1992-01-31

1993-12-28

Largen, James R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

D23263

Patent

active

D03427820

REFERENCES:
patent: D31835 (1899-11-01), Kuehn
patent: D33258 (1900-09-01), Kelly
patent: D234463 (1975-03-01), Ahlrot
patent: D335174 (1993-04-01), Anderson et al.
patent: 458994 (1891-09-01), Bieber
patent: 925762 (1909-06-01), Eager
patent: 2086007 (1937-07-01), Tompkins
patent: 2131804 (1938-10-01), Holub
patent: 2348455 (1944-05-01), Daudelin
patent: 2392220 (1946-01-01), Bruhn et al.
patent: 2823703 (1958-02-01), Nusser, Jr.
patent: 3185506 (1965-05-01), Szlashta
patent: 5121948 (1992-06-01), Anderson et al.
patent: 5145217 (1992-09-01), Anderson et al.

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