https://youtu.be/rgaW6AUlKew
https://youtu.be/libYHm_KvI0
https://youtu.be/3hB2qe8rrwE
https://youtu.be/RDuuz5UKWhc
https://youtu.be/bVVp0t1hfQI
1889- German Ferdinand von Zeppelin patents his ‘Navigable Balloon’.
https://m.youtube.com/watch?v=RzEr0cNvbfc
https://m.youtube.com/watch?v=0R81mDJGqt4
https://youtu.be/G1z0PAjzcDc
https://youtu.be/dhH3prPuc9A