ข้อมูลสัญลักษณ์จำแนกการออกแบบผลิตภัณฑ์ระหว่างประเทศ


รหัส / code คำอธิบาย / code name Version
H03G0009020000 in untuned amplifiers (combined tone controls for low and high frequencies H03G0005000000) 1
H03G0009040000 having discharge tubes 1
H03G0009060000 for gain control and tone control 1
H03G0009080000 incorporating negative feedback 1
H03G0009100000 for tone control and volume expansion or compression 1
H03G0009120000 having semiconductor devices 1
H03G0009140000 for gain control and tone control 1
H03G0009160000 incorporating negative feedback 1
H03G0009180000 for tone control and volume expansion or compression 1
H03G0009200000 in frequency-selective amplifiers 1
H03G0009220000 having discharge tubes 1
H03G0009240000 having semiconductor devices 1
H03G0009260000 in untuned amplifying stages as well as in frequency-selective amplifying stages (gain control in both stages H03G0003000000; tone control or bandwidth control H03G0005000000) 1
H03G0009280000 all amplifying stages having discharge tubes 1
H03G0009300000 all amplifying stages having semiconductor devices 1