Bidspirit auction | 4 books on aviation and

4 books on aviation and aircraft. - 4 books on aviation and aircraft. 1 x ”Einsteigen zum Flug” (Getting on board), by Peter Kneutz, Voigtländer Verlag Leipzig, 1938. 1 x ”Bosch Luftfahrt-Geräte” (Bosch aviation equipment), published by Robert Bosch GmbH Stuttgart, technical plans for starters, generators and regulators, etc. 120 pages. Approx. 1930s. 2 x manuals for JUMO Junkers aircraft, on their ”adjustable propellers, ” published in 1939 and 1940. Rubbed. Up to 25.5 x 19 cm