Why not patenting your invention first?
所有跟帖:
• 超聲波已經有幾十種應用。似乎很難申請專利。 -daqiu- ♂ (264 bytes) () 11/13/2009 postreply 21:28:27
• 超聲波已經有幾十種應用。似乎很難申請專利。 -daqiu- ♂ (264 bytes) () 11/13/2009 postreply 21:28:27
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