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Copper plane

This 24 x 28-inch copper plane is part of the densest computer packaging seen in the late-1980s...

This 24 x 28-inch copper plane is part of the densest computer packaging seen in the late-1980s...
This 24 x 28-inch copper plane is part of the densest computer packaging seen in the late-1980s. Used in large IBM computers, the plane was one of 20 layers in a 1/5-inch-thick printed circuit board that contained nearly a mile of wire interconnections. (VV3122)