Drop Things From a Drone | Drop Emergency Supplies From a Drone
Amazon.com: Release and Drop Professional Device for DJI Mavic AIR 2 / 2S - U.S. Patent - Drone Fishing, Bait Release, Load Delivery, Search and Rescue and Fun - by DRONE SKY
The design of a rotary-wing unmanned aerial vehicles–payload drop mechanism for fire-fighting services using fire-extinguishing balls | SpringerLink
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