Teaching ruler

Details Teaching ruler Teaching ruler

1995-05-19

1998-05-05

Fulton, Christopher W.

Geometrical instruments

Straightedge type

Rules

33494, 336791, G01B 304

Patent

active

057460019

ABSTRACT:
A linear measurement ruler comprises a teaching aid for instruction in fractional and decimal units of linear measure.

REFERENCES:
patent: 706242 (1902-08-01), Latshaw
patent: 1498485 (1924-06-01), Schmidtke
patent: 1602490 (1926-10-01), Homan
patent: 1776245 (1930-09-01), Barrett
patent: 2486748 (1949-11-01), Koenig
patent: 3936944 (1976-02-01), Byne
patent: 4547969 (1985-10-01), Haack
patent: 4614042 (1986-09-01), Maurer
patent: 4750270 (1988-06-01), Kundikoff
patent: 4965944 (1990-10-01), Kuze et al.

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