Of three series of flaps, the upstream series having its flaps hinged

Official title: {of three series of flaps, the upstream series having its flaps hinged at their upstream ends on a fixed structure and the internal downstream series having its flaps hinged at their downstream ends on the downstream ends of the flaps of the external downstream series hinged on a fixed structure at their upstream ends}

F02K1/1269 (Of three series of flaps, the upstream series having its flaps hinged) appears on 16 US grants and 9 published applications in this corpus.