Soldier using a light microphone set during World War I for local underground or surface listening. The observer can choose the distance from the point of detection, and the detectors can be used either underground or on the surface. This technology was valuable for trench reading operations.
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DETAILS
Image Number: 6145-51490729Royalty FreeCredit Line:PL Photography Limited/SuperStockCollection:PL Photography Limited Model Release:NoProperty Release:NoResolution:8457×5613
