Hi,Mr. C. Magerkurth designed a strange helicopter patent in 1925,I can't reach to thedirect link.
https://patents.google.com/patent/USD180019S/en?q=airplane&inventor=Harry+O.+Hedges&oq=++Harry+O.+Hedges+airplane
https://www.google.com/patents/US1622138?dq=Ellerman+airplane&hl=ar&sa=X&ved=0ahUKEwiT2K7urLHWAhWCtBoKHeRGBdQQ6AEIJjAA
https://www.google.com/patents/US1950915?dq=combing+airplane+and+helicopter&hl=ar&sa=X&ved=0ahUKEwiGisHL2a7WAhUCPRQKHXeYAXAQ6wEIXTAG
https://www.google.com/patents/US1550106?dq=F.+D.+SHAW+airplane&hl=ar&sa=X&ved=0ahUKEwi-lvSEp6zWAhXKbhQKHb3RAMcQ6AEIJjAA
https://www.google.com/patents/US1525557?dq=kleinschmidt+airplane&hl=ar&sa=X&ved=0ahUKEwjR9qvT8qTWAhVMlxoKHXKDAYsQ6AEIJjAA