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Patent portfolio assigned to ZeroSound (verified via public assignee records). Estimated patent count: 2. ZeroSound Systems Inc., Calgary (founded 2018), industrial active noise control for utilities/substations, BESS, data centres. Confirmed assignee on US 2019/0287511 'Apparatus and Method for Active Noise Reduction'; ~2 patents filed. Transelec (Chile) deployed tech at Ancoa substation; Rosenbauer (firefighting apparatus) partner.