Image: Office speaking tubes 1903
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Office_speaking_tubes_1903.jpg (600 × 496 pixels, file size: 57 KB, MIME type: image/jpeg)
Description: Speaking tubes hang off the end of a desk in this 1900s business office.
Title: Office speaking tubes 1903
Credit: http://www.officemuseum.com/photo_gallery_1900s.htm
Author: Photographer not credited
Permission: Public domain
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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