Color-coded ruler for three-phase wiring

Details Color-coded ruler for three-phase wiring Color-coded ruler for three-phase wiring

1986-02-12

1987-10-20

Haroian, Harry N.

Geometrical instruments

Straightedge type

Rules

B43L 702

Patent

active

047004916

ABSTRACT:
An electrician's color-coded ruler including sequentially numbered numerals each colored in one of three desired colors corresponding in a repeating pattern to the sequentially numbered poles of a three-phase panelboard.

REFERENCES:
patent: 1602490 (1926-10-01), Homan
patent: 1608713 (1926-11-01), Anderson
patent: 1631731 (1927-06-01), Johnson
patent: 2077828 (1937-04-01), Dombrowski
patent: 2089209 (1937-08-01), Keuffel et al.
patent: 2575077 (1951-11-01), Snyder
patent: 2602233 (1952-07-01), Iruing
patent: 2643166 (1927-09-01), Martin
patent: 3793732 (1974-02-01), Hamrick

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