Item consists of quad packs in a plastic case. Donor wrote, "Such quad paks began to generate enormous amounts of heat, requiring elaborate heat sinking methods, shown in this collection. In the 1970s, tighter pin spacing and higher pin counts began to invade the quad market, as it had earlier invaded the dual inline and prior package configurations in the 1960s." Handwritten on paper label is, "44 LEAD FORMAT 31 LEAD LEADFRAME," and, "72 LEAD FORMAT 68 LEAD LEADFRAME."