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http://www.google.com.au/patents/US3320347?utm_source=gb-gplus-share
Patent US3320347 - METHOD OF MAKING AN ARCH SUPPORT BY MEASURING AN IMPRESSION OF A FOOT
METHOD OF MAKING AN ARCH SUPPORT BY MEASURING AN IMPRESSION OF A FOOT
Monte H. Greenawalt et al
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Patent number
: 3320347
Filing date
: 18 May 1964
Issue date
: 16 May 1967
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