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U.S. testing liveliness of baseballs. Washington, D.C., Feb. 21. Exper...
Public domain photograph of people in office, interior, the 1910s-1920s America, free to use, no copyright restrictions image - Picryl description
Bureau of Standards designs mechanical batter to determine liveliness ...
Two men working on a machine in a factory. Public domain portrait photograph, free to use, no copyright restrictions image - Picryl description
U.S. testing liveliness of baseballs. Washington, D.C., Feb. 21. Exper...
A black and white photo of two men in a lab, Library of Congress Harris and Ewing collection Title from unverified caption data received with the Harris & Ewing Collection. Gift; Harris & Ewing, Inc. 1955. Gen... More