Chieh-Tseng Chiang

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Tang San Hsien, I Lan Hsien, TW

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Patents Grantslast 30 patents

Information Patent Grant
Structure of isometric ellipse scale
- Patent number 5,065,523
- Issue date Nov 19, 1991
- Chieh-Tseng Chiang
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES