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Sang Kohn Chang
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Taegu, KR
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Patents Grants
last 30 patents
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Patent Grant
Manual hand ratch reamer for dentist
Patent number
6,517,349
Issue date
Feb 11, 2003
Sang Kohn Chang
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Patents Applications
last 30 patents
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Patent Application
ORTHODONTIC DEVICE
Publication number
20180140384
Publication date
May 24, 2018
Sang Kohn CHANG
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Patent Application
Manual hand ratch reamer for dentist
Publication number
20020034716
Publication date
Mar 21, 2002
Sang Kohn Chang
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE