Wilson Mechanical Instrument Co., Inc.
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Product Details
CompanyWilson Mechanical Instrument Co., Inc.
Certificate Type
Capital Stock
Date Issued
May 10, 1944
Canceled
Yes
Printer
Broun-Green Co.
Signatures
Hand signed
Approximate Size
12 1/4" (w) by 8 3/4" (h)
Images
Show the exact certificate you will receive
Guaranteed Authentic
Yes
Additional Details
NA
Historical Context
Hugh M. Rockwell (1890–1957) and Stanley P. Rockwell (1886–1940) from Connecticut co-invented the "Rockwell hardness tester," a differential-depth machine. They applied for a patent on July 15, 1914. The requirement for this tester was to quickly determine the effects of heat treatment on steel bearing races. The application was subsequently approved on February 11, 1919, and was assigned U.S. Patent 1,294,171. At the time of invention, both Hugh and Stanley Rockwell worked for the New Departure Manufacturing Co. of Bristol, Connecticut. New Departure was a major ball bearing manufacturer which in 1916 became part of United Motors and, shortly thereafter, General Motors Corporation.
After leaving the Connecticut company, Stanley Rockwell, then in Syracuse, New York, applied for an improvement to the original invention on September 11, 1919, which was approved on November 18, 1924. The new tester was given U.S. Patent 1,516,207.
Rockwell moved to West Hartford, Connecticut, and made an additional improvement in 1921. Stanley collaborated with instrument manufacturer Charles H. Wilson of the Wilson-Mauelen Company in 1920 to commercialize his invention and develop standardized testing machines. The company, which would be renamed the Wilson Mechanical Instrument Company, and based in New York City, developed the superficial Rockwell hardness tester in 1932 for measuring the hardness of sheet metal, brittle materials, and other specimens not suitable for the original higher-load test.
The company was later purchased by the American Chain and Cable Company, the first of many ownership changes over the year.
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