《INDEX TO THE U.S.PATENT CLASSIFICATION DECEMBER 1980》
作者 | 编者 |
---|---|
出版 | U.S.DEPARTMENT OF COMMERCE PATENT AND TRADEMARK OFFICE |
参考页数 | 233 |
出版时间 | 1980(求助前请核对) |
ISBN号 | 无 — 求助条款 |
PDF编号 | 813028218(仅供预览,未存储实际文件) |
求助格式 | 扫描PDF(若分多册发行,每次仅能受理1册) |

1980《INDEX TO THE U.S.PATENT CLASSIFICATION DECEMBER 1980》由于是年代较久的资料都绝版了,几乎不可能购买到实物。如果大家为了学习确实需要,可向博主求助其电子版PDF文件(由 1980 U.S.DEPARTMENT OF COMMERCE PATENT AND TRADEMARK OFFICE 出版的版本) 。对合法合规的求助,我会当即受理并将下载地址发送给你。
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