Patent and Trademark Office Collection of Historical and Interesting U.S. Patents in Celebration of Our Nation's Bicentennial

Patent and Trademark Office Collection of Historical and Interesting U.S. Patents in Celebration of Our Nation's Bicentennial

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... for electric welding welt a–i Improvement in machines for sewing boots and shoes; Goodyear welt Wireless receiving system xerography a–i Electron photography; xerography X-ray tube X-ray tube zipper a–i Clasp locker or unlocker for shoes;anbsp;...


Title:Patent and Trademark Office Collection of Historical and Interesting U.S. Patents in Celebration of Our Nation's Bicentennial
Author: Bruce B. Cox, Amy K. Englund
Publisher: - 1987
ISBN-13:

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