Geometrical instruments – Straightedge type – Base attached
Patent
1988-04-29
1989-09-26
Haroian, Harry N.
Geometrical instruments
Straightedge type
Base attached
281 45, B43L 500
Patent
active
048689912
ABSTRACT:
A control apparatus insures precise reading or entry of data in the proper columns and rows or lines of chart sheets mounted atop a board. The same columns with appropriate indicia appear on both the top of the chart sheets and on a vertically shiftable ruler member attached to the board. A slide block associated with the ruler member not only maintains the ruler in a positive horizontal disposition parallel to the chart sheet rows but automatically adjusts in height to accommodate a varied amount of chart sheets on the board.
REFERENCES:
patent: 1240621 (1917-09-01), Story
patent: 1452694 (1923-04-01), Lund
patent: 1483176 (1924-02-01), Henrikson
patent: 1817640 (1931-08-01), Newman et al.
patent: 1863633 (1932-06-01), Melind
patent: 2670221 (1954-02-01), Wellendorf
patent: 2725030 (1955-11-01), Hughesx
patent: 2864169 (1958-12-01), Klabunde
patent: 4545140 (1985-10-01), Winston
Gilbert Michael D.
Marbley Lonnie R.
Worthington Dennis V.
Haroian Harry N.
Litman Richard C.
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