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| Keywords: T A Edison 1stPatent.jpg 摘要 湯馬士．艾爾巴．愛迪生第 件嘅專利發明品－－－電氣投票 錄機 議員只要按檯上 嘅 贊成 或 反對 制，議長就可以 到票決結 嘅數字 但冇實際用應到 PD-old Patents by Thomas Alva Edison 1869 | ||||
