共 50 条
- [22] OPPOSITION AND THE VALIDITY OF PATENTS IN THE ENGLISH-SPEAKING COUNTRIES JOURNAL OF THE PATENT OFFICE SOCIETY, 1958, 40 (01): : 47 - 69
- [29] PATENTS AND PATENTING FOR ENGINEERS AND SCIENTISTS - JOENK,RJ RESEARCH MANAGEMENT, 1982, 25 (05): : 43 - 43