Inventor's manual, how to work a patent to make it pay; a guide for inventors, in perfecting their inventions, taking out their patents, and disposing of them, and cautions as to pitfalls for the unwary (1918)
Hopkins, George M. (George Milton), 1842-1902, Hopkins, Albert A. (Albert Allis), 1869-1939, ed · New York, The Norman W. Henley publishing company · leaf 195
e Most Valuable Techno-Chemical RecipeBook Ever Offered to the Public! Henleys Twentieth Century Book of RECIPES, FORMULASAND PROCESSES Price $3.00 This book of 800 pages is the most complete Book of Recipesever published, giving thousands of recipes for the manu-facture of valuable articles for… … should at his everyonecommand. The pages are _ filled withmatters of intense interest andimmeasurable practical value tothe Photographer, the Perfumer,the Painter, the Manufacturerof Glues, Pastes, Cements andMucilages, the Physician, theDruggist, the Electrician, theBrewer, the Engineer,…
Patents · Inventions
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