http://www.wipo.int/ipstats/en/statistics/patents/wipo_pub_931.html#a13
看看這個吧 (圖)
http://www.wipo.int/ipstats/en/statistics/patents/wipo_pub_931.html#a13
所有跟帖:
• 這個UN的data有多準確不敢說,與平常的定義也有差 -beingandtime- ♀ (741 bytes) () 02/28/2010 postreply 22:11:53