Patent Doc-UK and USA-1929-Spain-Cierva Autogiro Co Ltd -Helicopters- Scarce VF

Patent Doc-UK and USA-1929-Spain-Cierva Autogiro Co Ltd -Helicopters- Scarce VF (image 1/3)
Patent Doc-UK and USA-1929-Spain-Cierva Autogiro Co Ltd -Helicopters- Scarce VF (image 2/3)
Patent Doc-UK and USA-1929-Spain-Cierva Autogiro Co Ltd -Helicopters- Scarce VF (image 3/3)
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Scarce usage of Revenue on Patent Doc for Helicopter inventions by ALPHONSO XII Madrid in the Kingdom of Spain (Engineer); intact document filed in the USA patent office; "Aircraft with Rotative Wings"; Aerophilately; Revenue philately; paper empherm; great and seldom seen item; in great condition; nice historical item of note;
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