Inventor's manual, how to work a patent to make it pay
Subtitle: a guide for inventors, in perfecting their inventions, taking out their patents, and disposing of them, and cautions as to pitfalls for the unwary
By: by George M. Hopkins ... revised by A.A. Hopkins ...
Contributors: Hopkins, Albert Allis, 1869- ed.
Edition: 3d ed., rev. and enl., including the new 1920 census of the United States by counties containing a population of over ten thousand.
Publisher: The Norman W. Henley Publishing Company
Published: 1924
Place of publication: New York
Language: eng
Number of pages: 138
Subjects: Patents; Inventions