150000003071 polychlorinated biphenyls Chemical class 0.000 description 7.238000005859 coupling reactions Methods 0.000 description 7.230000001131 transforming Effects 0.000 claims description 7.239000011261 inert gases Substances 0.000 claims description 10.239000012212 insulators Substances 0.000 claims description 17.230000000875 corresponding Effects 0.000 claims description 21.229920002379 silicone rubbers Polymers 0.000 claims description 24.239000000463 materials Substances 0.000 claims abstract description 84.Assignors: CHANG, YOUNG-SO Status Abandoned legal-status Critical Current Links ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to KR20-2002-0023572 priority Critical Priority to KR2020020023572U priority patent/KR200294131Y1/en Application filed by Young-So Chang filed Critical Young-So Chang Publication of US20050034591A1 publication Critical patent/US20050034591A1/en Assigned to KIM, N. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Abandoned Application number US10/888,270 Inventor Young-So Chang Original Assignee Young-So Chang Priority date (The priority date is an assumption and is not a legal conclusion. Google Patents US20050034591A1 - Roll-up electronic piano
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