? The invention patent was authorized by the State Intellectual Property Office，Shenzhen Hpmont Technology Co., Ltd.Shenzhen Hpmont Technology Co., Ltd.

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The invention patent was authorized by the State Intellectual Property Office
Release time：2013-01-30

In January 2013, the invention patent "method and system for smooth switching AC motor from inverter power supply to power frequency power supply" of Shenzhen Hpmont Technology Co., Ltd. was authorized by the State Intellectual Property Office, with the patent number of 201110210903.9.


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