Inventor's manual, how to work a patent to make it pay : a practical and useful guide to inventors, giving useful hints and directions in perfecting inventions, taking out patents and disposing of them
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書誌事項
Inventor's manual, how to work a patent to make it pay : a practical and useful guide to inventors, giving useful hints and directions in perfecting inventions, taking out patents and disposing of them
The Norman W. Henley, 1906, c1901
New, rev., and enl., ed., including the 1900 census of the United States, by counties containing a population of over ten thousand
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Inventor's manual
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Includes index