Geometrical instruments – Straightedge type – Combined with level
Patent
1987-03-17
1988-03-29
Stearns, Richard R.
Geometrical instruments
Straightedge type
Combined with level
33471, 33478, 33527, 33DIG20, B43L 700, B43L 1300
Patent
active
047334770
ABSTRACT:
A chalk line framing square is provided to aid in placing right angle intersecting chalk lines upon a floor so that tiles can be properly installed on the floor. The framing square can check the squareness of the tiles as they are installed without being placed in the adhesive.
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patent: 2939219 (1960-06-01), Georges
patent: 3154861 (1964-11-01), Rubenstein
Fincham James R.
Spector George
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