Kaiserliches Patentamt u.a.
2 items consisting... Lot 893
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Kaiserliches Patentamt u.a.
2 items consisting of: 1x "Patent Document", Imperial Patent Office, September 26, 1912, for a "Device for the forced opening and closing of the wing flaps of flapping wings", with description a. schematic drawing, min. creased/browned, plus: 1x probably ecclesiastical document from 1615, signed with "Ad Mandatum Sacrae Caesareae Regiae [...] proprium", browned, creased, partly dam. a. rest.
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