Electrical thrust producing device
https://patents.google.com/patent/US2958790A/en?oq=2958790
https://patents.google.com/patent/US3263102A/en?oq=US3263102
Electrical thrust producing device
https://patents.google.com/patent/US2958790A/en?oq=2958790
https://patents.google.com/patent/US3263102A/en?oq=US3263102