This is a mockup of the valve train components of a World War II (WWII) era Pratt & Whitney Radial Aircraft Engine. Parts Manufacturing Company of Greenfield, Massachusetts, innovated a highly specialized process that was used to apply a special finish of exacting tolerances to these valve train parts. This innovation contributed greatly to Pratt & Whitney’s guarantee of “dependable engines.” During WWII, employees in the plant worked around the clock to supply the Pratt & Whitney Aircraft Plant, 60 miles south in Harford, Connecticut, with trainloads of finished parts.
Parts Manufacturing Company. Parts Manufacturing Company 3 dimensional airplane part. ca. 1940. Pocumtuck Valley Memorial Association, American Centuries. https://americancenturies.org/collection/m-71/. Accessed on March 21, 2025.
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