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Trident Pneumatic Antenna Launcher
TENNIS BALL CANNON : 11 Steps - Instructables
John W. Cornwell Pneumatic Tennis Ball Launcher, Potato Gun, Spud Cannon, etc.
Compressed Air Tennis Ball Mortar : 7 Steps - Instructables
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4 options for building a tennis ball cannon for dogs: the research phase * DOGthusiast: for dog enthusiasts with active dogs
Tennis Ball Cannon | Gotham Machine
tennis ball cannon 4 by ildoctore on DeviantArt
The Spudgun Technology Center - Details for the 2.5" SCH 40 Tennis Ball Barrels