Two-horn system, USA 1921 |
four-horn acoustic radar, Czech, 1920-an |
four-horn acoustic locator, England, 1938 |
four horn acoustic radar, England 1930-an |
akoustic locator, Japan, 1930-an |
Acoustic locator, German, 1930-an |
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Two-horn system, USA 1921 |
four-horn acoustic radar, Czech, 1920-an |
four-horn acoustic locator, England, 1938 |
four horn acoustic radar, England 1930-an |
akoustic locator, Japan, 1930-an |
Acoustic locator, German, 1930-an |
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