Shenzhen Kinghelm Electronics Co., Ltd. In 2018, Shenzhen Kinghelm Electronics Co., Ltd. was granted an invention patent for its Beidou-Based Intelligent Container Electronic Lock. By integrating ...
This intelligent electronic lock circuit is built using transistors only. To open this electronic lock, one has to press tactile switches S1 through S4 sequentially. For deception you may annotate ...
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