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OP 1673A - German Underwater Ordnance; Chapter 11 - Influence Mine Units - SVK and Luftwaffe; Section 3 - Acoustic Mine Units: Microphones
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OP 1673A - German Underwater Ordnance; Chapter 11 - Influence Mine Units - SVK and Luftwaffe; Section 3 - Acoustic Mine Units: Microphones
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OP 1673A - German Underwater Ordnance; Chapter 11 - Influence Mine Units - SVK and Luftwaffe; Section 3 - Acoustic Mine Units: Microphones
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