Contains: above all correspondence between the Reichs-Marine-Amt and the Luftschiffbau Zeppelin GmbH concerning Repairs, test report on the stern load of L 61 / LZ 106, speed, L 70 / LZ112, duraluminium cover, L 53 / LZ 100, ballast water bags, double trousers, L 65 / LZ 111, L 62 / LZ 107, spare cooling water tank, rubber cells, 260 HP propellers, payment for airships, naval hall of fame, Telephone system, reports on defects in L 61 and L 62, L 59 / LZ 104, engines, complaints about invoices, gas shafts, four-point landing gear, oxyhydrogen gas, shipping details, cell protective cladding, L 54 / LZ 99, propeller, test airship, skeleton paint, gearbox, Bruhnscher tachometer