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  Google Scholar

  http://scholar.google.de/scholar?q=traveling%20OR%20travelling%20salesperson%20-%22salesman%22&hl=en&as_sdt=2001&as_sdtp=on

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  X-ray Shoe Fit Check 1920s - YouTube

  https://www.youtube.com/watch?v=wbMN6jueU1A

  The shoe fitting fluoroscope was a common fixture in shoe stores during the 1930s, 1940s and 1950s. The first fluoroscopic device for x-raying feet may have ...

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