United States patent for a bent steel shank invented by Salvatore Ferragamo
United States Patent 1,862,359, granted Jun 7, 1932, filed May 9, 1930
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especially applicable to the reinforcement of the instep-supporting arch of the soles of ladies’ shoes, so that said sole shall constitute even in the rising arched part thereof, which does not touch the ground in walking, a supporting plane for the foot.
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properly supported between the toe and the plane of the sole, arch and heel
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ladies’ light shoes where the pronouncedly high heels do not allow of the due support…owing to the thinness of the soles…
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metal plate…doubled over, suitably arched or curved, and which is fitted into the thickness of a piece of leather
- fixed with clinching nails
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pocket made for the fitting of the part…in such manner that the thickness of the leather will remain quite uniform