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Search Criteria
Image Date = 1971
Image Number = 696
Image Title:
Device invented by Dr E. M. Cherry, to take echo out of long-distance telephone conversations
Photographer: Unknown
Notes:
Colour or not: Black & White
Media: Photograph
Image Date: 1971
Dimensions: 120 x 125 mm
Subject Descriptor: Electrical Engineering
Image Number: 696
APT Topics: Inventions;
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