NTT DOCOMO: featherless indoor drone-ultrasonic vibration module
NTT DoCoMo:
we have developed a highly safe indoor drone that flies by ultrasonic vibration.
This airship drone:
The ultrasonic vibration module which generates a wind by a minute vibration.
It is safe for people and things to touch, and the noise during flight is also quiet.
Makuhari Messe from April 27 (Sat), 2019: The Nico Nico Super Conference 2019
You can experience maneuvering at “Nippon Telegraph and Telephone Corporation Mikaka Land, NTT Ultra Future Research Institute 6”.
https://www.nttdocomo.co.jp/info/news_release/2019/04/17_01.html