Electrical Supply Store
2432 West Peoria Avenue Suite 1094 Phoenix, AZ 85029
Diamond H Company LLC, doing business as Quick 220® Electrical Systems, was formed in Arizona in 1994 to develop the concepts embodied in the Quick 220® Voltage Converting Power Supply. The first model was made available to the public and sold in 1998. In 1999, United States Patent 5,977,658 was issued covering the safety circuit employed within the Quick 220® Power Supply.
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