The Economic Studies Quarterly (Tokyo. 1950)
Online ISSN : 2185-4408
Print ISSN : 0557-109X
ISSN-L : 0557-109X
A Note on the Classification of Technical Inventions
Hirofumi UzawaTsunehiko Watanabe
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1961 Volume 12 Issue 1 Pages 68-72

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© The Japanese Economic Association
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