Well cover

Details Well cover Well cover

1995-06-23

1998-10-06

Zarfas, Louis S.

Building units and construction elements

Structure

Having curved or vaulted roof

D25 18, D25 31, 2503

Patent

active

D03993221

REFERENCES:
patent: D373426 (1996-09-01), Maxwell
patent: 830782 (1906-09-01), Gray
patent: 2179191 (1939-04-01), McWilliams
patent: 2601820 (1952-07-01), Paul et al.
patent: 4848458 (1989-07-01), Holdsworth et al.
patent: 5184608 (1993-02-01), Hale, III
patent: 5437309 (1995-08-01), Timmons

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