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automatic 3-Way Cube
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Academy Electrical Products Corp., New York:  automatic 3-way cube instruction card (1956)

1 - 4 Academy automatic 3-way cube. 1-3: side, top and bottom view. 4: inside view. Both sharp copper needles have to punch the flat wire insulation. The blades of inserted plugs make contact with the sides of the copper strips. A simple construction that works as long as you avoid an excessive pulling force on the wire. The dimension of this ingenious design is only 4.5 x 2.9 x 2.5 cm (1.8 x 1.1 x 1.0 inch).
Patent application date: March 23, 1954. See Multiple cord plug receptacle patent for details.
 


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