The 6 x 8-1/2 inch, 186 page hardcover book by Robert Kahler was published in 1939 by Verlag der deutschen Arbeitsfront in Berlin. The very interesting book deals about the laws, regulations and procedures an inventor had to follow when he/she wanted to get his/her invention patented. Offered here is a nice copy of the first edition that was published in a number of only 5,000 copies.
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