Extract from the Register of European Patents

EP Citations: EP0187211

Cited inSearch
Type:Patent literature
Publication No.:US4138915  [Y]
 (NAGAI YOHEI, et al);
Type:Patent literature
Publication No.:GB2103005  [Y]
 (NIPPON MUSICAL INSTRUMENTS MFG [JP]);
Type:Patent literature
Publication No.:US4267761  [A]
 (DEUTSCH RALPH)