Ruler teaching apparatus

Details Ruler teaching apparatus Ruler teaching apparatus

1993-03-03

1994-10-25

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D10 71

Patent

active

D03518582

REFERENCES:
patent: D206551 (1966-12-01), Nystrom
patent: D229223 (1973-11-01), Corn
patent: D288538 (1987-03-01), Cabaniss, III
patent: D290397 (1987-06-01), Starkey
patent: D339305 (1993-09-01), Klein
patent: 703208 (1902-06-01), Lawrence
patent: 747380 (1903-12-01), Cooke
patent: 1659739 (1928-02-01), Kuhlman
patent: 1699847 (1929-01-01), Kuhlman
patent: 1888305 (1932-11-01), Berger
patent: 2291552 (1942-07-01), Lalonde
patent: 2402658 (1946-06-01), Nedela
patent: 2422745 (1947-06-01), Ost
patent: 2456676 (1948-12-01), Chowns
patent: 3258844 (1966-07-01), Godman
patent: 3465453 (1969-09-01), Sganga
patent: 3837569 (1974-09-01), Bradbury et al.
patent: 3949491 (1976-04-01), Harte
patent: 4144657 (1979-03-01), Dumovich
Cenco Educational Catalog, 1969, p. 1, Element #72695.
Welch Physics Digest, Apr. 1951 p. 27 Vernier Caliper on top of page.

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