The story of the American patent system, 1790-1952

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245 1 4 ‡aThe story of the American patent system, 1790-1952.
250 ⊔ ⊔ ‡a[2d ed.
260 ⊔ ⊔ ‡aWashington, ‡bU.S. Govt. Print. Off., ‡c1953]
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