Related Clues:
- Scientific breakthrough of the '30s
- Plane-tracking device
- Pitching coach's aid
- Speeder snagger
- ___ gun
- Leadfoot's nemesis
- Gun at a ball game
- Air-traffic aid
- "M*A*S*H" character with great hearing
- 'M*A*S*H*' palindrome
- Speed gauge
- Aircraft equipment
- Gun in a dugout
- Air-traffic detector
- Defense mechanism?