■ تکنولوژی رادارهای ابتدائی صوتی بخش عمومی

STRANGE ACOUSTIC "EARS"
BEFORE RADAR - LISTENING POSTS
STRANGE ACOUSTIC "EARS"
BEFORE RADAR - ON A SWIVEL
STRANGE ACOUSTIC "EARS"
BEFORE RADAR - GERMAN
STRANGE ACOUSTIC "EARS"
BEFORE RADAR - ON WHEELS
TRANGE ACOUSTIC "EARS"
BEFORE RADAR - ENGLAND