Skip to content

Inventions to Listen for Airplanes Before Radar!

Inventions to Listen for Airplanes Before Radar! In

Before radar was invented militaries needed a way to be alerted to an incoming plane. Below are a few of the inventions designed for just that purposes.

Inventions to Listen for Airplanes Before Radar! In
Inventions to Listen for Airplanes Before Radar! In
Inventions to Listen for Airplanes Before Radar! In
Inventions to Listen for Airplanes Before Radar! In
Inventions to Listen for Airplanes Before Radar! In
Inventions to Listen for Airplanes Before Radar! In

Thoughts?