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The maker of a child-resistant cannabis storage lock box accused a rival packaging company of knocking off its patented design after licensing talks allegedly failed.

Rhode Island-based Contempo Card Co. Inc. accused Superior Bindery Inc. and a Massachusetts chain of medical marijuana dispensaries of making and marketing a lookalike version of Contempo’s patented Vault Box, which is designed to protect children from accessing potentially harmful cannabis products, according to a complaint filed August 29 in the US District Court for the District of Massachusetts.

Contempo said Superior expressed “interest in the Vault Box’s innovative design” beginning in late 2018, after …

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