Pipe joints or couplings – Particular interface – Annular socket
Patent
1985-11-04
1987-06-02
Arola, Dave W.
Pipe joints or couplings
Particular interface
Annular socket
285286, 285371, 285424, A16L 2500
Patent
active
046697624
ABSTRACT:
A connector to receive the top and bottom member of a duct system.
REFERENCES:
patent: 442837 (1890-12-01), Ward
patent: 1450826 (1923-04-01), Walten
patent: 1762766 (1930-06-01), Goray
patent: 2189159 (1940-02-01), Anschicks
patent: 2360159 (1944-10-01), Peck
patent: 3483665 (1969-12-01), Miller
patent: 3512805 (1970-05-01), Glatz
patent: 3796057 (1974-03-01), Dougherty
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