Friday, November 9, 2012

Aircraft Detection Before Radar Invented

Aircraft Detection Before Radar
 
 

 
 
 

 

acoustic hearing aids
 

 
 
 
ACOUSTIC "EARS"
BEFORE RADAR - ON A SWIVEL
 

 

 
 
 
 


   
 
 
ACOUSTIC "EARS"
BEFORE RADAR - GERMAN
 
 
 
ACOUSTIC "EARS"
BEFORE RADAR - ON WHEELS