Concrete pipe spacer

Details Concrete pipe spacer Concrete pipe spacer

1990-10-01

1992-11-10

Burke, Wallace R.

Tools and hardware

Fastener, support or mount not elsewhere specified

Support, guide, or spacer

Patent

active

D03308464

REFERENCES:
patent: 3471986 (1969-10-01), Swenson
patent: 3722164 (1973-03-01), Schmidgall
patent: 4301638 (1981-11-01), Schmidgall
patent: 4939883 (1990-07-01), Swenson
patent: 4989388 (1991-02-01), Schmidgall et al.
patent: 4999965 (1991-03-01), Schmidgall et al.

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