Masonry line block

Details Masonry line block Masonry line block

1988-11-17

1991-02-26

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03149200

REFERENCES:
patent: 2407389 (1946-09-01), Stevens
patent: 2523101 (1950-08-01), Edixion
patent: 2530121 (1950-11-01), Garwood
patent: 2611963 (1952-09-01), Zinken
patent: 3119186 (1964-01-01), Stewart
patent: 3200500 (1965-08-01), Stone
patent: 3408742 (1968-11-01), Caprico et al.
patent: 3436832 (1969-04-01), Juberigan
patent: 3751810 (1973-08-01), Valva

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