Geoffrey G. Clewlow original design for the GCA-24, 1952:
http://www.google.com/patents/USD166851
lllll As of 2019 I have transitioned; My name is now Rei. Please don't deadname or misgender me, thank you. <3 lllll
Peter J. Papadakos compound helicopter design, 1953:
http://www.google.com/patents/USD168652
Edward W. Strong compound helicopter design, 1953:
http://www.google.com/patents/USD170247
David F. Gebhard / Edward W. Strong single-seat coaxial-rotor helicopter design, 1954:
http://www.google.com/patents/USD172467
David F. Gebhard original design for the GCA-32, 1954:
http://www.google.com/patents/USD172712
Peter J. Papadakos early design for the Gyroliner, 1954:
http://www.google.com/patents/USD172721
Peter J. Papadakos compound coaxial design, 1954:
http://www.google.com/patents/US2665859
Peter J. Papadakos coaxial-rotor helicopter design, 1955:
http://www.google.com/patents/USD175852
Peter J. Papadakos 1955 design:
http://www.google.com/patents/USD176377
Peter J. Papadakos original GCA-35 design, 1956:
http://www.google.com/patents/USD177425
Peter J. Papadakos coaxial-rotor heavy-lift helicopter design, 1956:
http://www.google.com/patents/USD177426
Peter J. Papadakos coaxial-rotor design (GCA-33?), 1956:
http://www.google.com/patents/USD177427
Peter J. Papadakos compound design, 1956:
http://www.google.com/patents/USD178081
Peter J. Papadakos 1957 design (I presume is a heavy-lifter):
http://www.google.com/patents/USD180958
Peter J. Papadakos 1959 design:
http://www.google.com/patents/USD186478