July 23rd, 2012
(via SPLITTING HAIRS TO SPEED CALLS | Modern Mechanix)

(via SPLITTING HAIRS TO SPEED CALLS | Modern Mechanix)

  1. terta reblogged this from mudwerks
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8 notes Source: blog.modernmechanix.com #SPLITTING HAIRS TO SPEED CALLS#ad#vintage#Scientific American#1954#Telephone#Bell#laboratories#tube#tech
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