Original language | English GB |
---|---|
Patent number | US3531303 |
IPC | C03C 10/ 06 A I |
Priority date | 22/05/67 |
State | Published - 29 Sep 1970 |
Original language | English GB |
---|---|
Patent number | US3531303 |
IPC | C03C 10/ 06 A I |
Priority date | 22/05/67 |
State | Published - 29 Sep 1970 |