Description: Sound of international distress signal in radio-telegraph connection.

Description: Sound of international distress signal in radio-telegraph connection.

Description: Sound of international distress signal in radio-telegraph connection.

Description: Sound of international distress signal in radio-telegraph connection.

Description: Sound of international distress signal in radio-telegraph connection.

Description: Sound of international distress signal in radio-telegraph connection.

Description: Sound of international distress signal in radio-telegraph connection.

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