[Boatanchors] Article on changing from 2 to 3 wire power cords

LARRY PICARD lmpicard at rogers.com
Wed Aug 7 11:42:18 EDT 2019

I live in an older home.  
Before the knob and tube wiring was replaced a number of years ago, the original electrical outlets had only two slots and they were both the same size.
Does anyone know when three prong plugs and polarized plugs and their respective receptacles came into use? 

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