Hallmark Circuits, Inc. was established in 1970 and is ranked the top 50 printed circuit board suppliers United States. -30 layers -2.5 mil lines -4 micro vias (laser drill) -10:1 aspect ratio -Blind & Buried -PC Cards 8 / 22 mils thick -Thin core (1.0 mil) -Buried Capacitance -Impedance; ...