... early 1980.1)Items——membrane switch, keypad, membrane keypad, keyboard switch, switch panel, membrane panel, membrane overlay, membrane faceplate for variety electronic industries ... semi-laminate.4) Embossing——Dome above the circuit layer, it can be metal(stainless steel) dome ... COCKTAILS, FOURPILLARS and so on8)Feature & performance:a) Maximum circuit rating——35V DC, 100mA, 1Wb) Contact resistance——10 - ...