ข้อมูลby generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling


เวอร์ชั่นข้อมูล

เวอร์ชั่น รหัส / code คำอธิบาย / code name เครื่องมือ
1 H04M0001515000 by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling 29/09/2562