... began early 1980.1)Items——membrane switch, keypad, membrane keypad, keyboard switch, switch panel, membrane panel, membrane overlay, membrane faceplate for variety electronic industries ... & smooth ,velvet,matte & coarse finish, semi-gloss with semi-laminate.4) Embossing——Dome above the circuit layer, ... metal(stainless steel) dome 5)Circuit layer——Available with LEDs in a variety of colors and standard ...