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Excerpt from Definitions of Revised Classes and Subclasses of Subjects of Invention in the United States Patent Office: Arranged in Numerical Order; A Supplement to the Manual of Classification; Revised to January 1, 1912
For features of staple setting and riveting machines, search should also be made in the various subclasses in class 218, button, eyelet, and rivet setting.
For features of shoe nailing, search should include the combined machines for nailing, lasting, trimming, etc., under class 12, boot and shoe making.
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