Manual of classification of subjects of invention of the United States Patent office.
Rev. to January 1, 1920 (including classification bulletin no. 43)

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Corporate Author: United States. Patent Office.
Related Names: United States. Patent Office.
Language(s): English
Published: Washington, Govt. print. off., 1920.
Subjects: Patents > Patents / United States
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Physical Description: 298 p. 27 cm.
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