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Slide Rule, William J. Powell, ca. 1930s. Creator: Keuffel & Esser Co..
 
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2-839-965
Circular Slide Rule, William J. Powell, 1935. Creator: Unknown.
 
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2-839-966
Drafting pen owned by William J. Powell, ca. 1920s. Creator: Unknown.
 
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2-839-968
Drafting pen owned by William J. Powell, ca. 1920s. Creator: Unknown.
 
Video
2-839-969
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