Notes: "First Edition" on title page. First printing (not stated). Bound in flexible plastic covers, no jacket. No price given. According to Laughlin & Levack, De Camp, Underwood-Miller, 1983 there is a second printing (1940), a series of 13 paperbacks containing the first printing, a second and third edition, a second printing of the third edition and two printings of a fourth edition retitled Inventions, Patent, and Their Management.