Labels:airplane | ball | box | bulletin board | cabinet | car | fence | map | monitor | person | road | rock | sky | traffic light | tree | washer | water OCR: PREVIC The helicopter was developed after the fixed-wing airplane was perfected. An Italian Renaissance artist helped develop the helicopter. The first working prototyp helicopter was flown in the 20th century. The first man to fly helicopter was Italian. LESSONS HELP prototype OOPTS
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