Tread and riser stair gauge

Details Tread and riser stair gauge Tread and riser stair gauge

1986-02-10

1990-02-06

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 65

Patent

active

D03058735

REFERENCES:
patent: D287944 (1987-01-01), Hewston
patent: 759319 (1904-05-01), Schumacher
patent: 847720 (1907-03-01), Barbo
patent: 1205687 (1916-11-01), Verhey
patent: 1244570 (1917-10-01), Woods
patent: 1261596 (1918-04-01), Murvine
patent: 1489789 (1924-04-01), Ryan
patent: 1624535 (1927-04-01), Christianson
patent: 3991474 (1976-11-01), Rath

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