Sterling Plastics 542 T-Square

This 13" white plastic T-square is marked on the handle: STERLING – 542. It is also marked: MADE USA. The handle has a scale of 12 inches, divided to 1/16" and numbered by ones from 1 to 12, and a 30.5 centimeter scale, divided to millimeters, numbered by ones from 1 to 30, and marked: MM. A hole near the end of the handle permits hanging.
George and Mary Staab operated Sterling Plastics in Mountainside, New Jersey, from 1938 through the late 1960s. The firm was a division of Borden Chemical Company in the 1970s and 1980s and was purchased by Sanford Corporation in 1988. See also MA*335327, 1988.0807.01, 1990.0689.01, and 1998.3104.01. Isaac Giacinto Molella, who worked as an electrical engineer for General Electric in the United States, North Africa, and Europe in the 1950s, previously owned this T-square.
Currently not on view
Object Name
date made
Sterling Plastics
Physical Description
plastic (overall material)
overall: 33.2 cm x 15.8 cm x .6 cm; 13 1/16 in x 6 7/32 in x 1/4 in
place made
United States: New Jersey, Mountainside
ID Number
accession number
catalog number
Squares and Triangles
Science & Mathematics
Drafting, Engineering
See more items in
Medicine and Science: Mathematics
Squares and Triangles
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Elizabeth P. Molella

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