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Document with design patents from Orbit. KR—300863123.0000 Sensible heat exchanger Nov. 22, 2019, KR—300859556.0000 Latent heat exchangers Jun. 20, 2016, KR—300849333.0000 Heat exchanger for boilers Apr. 14, 2016, KR300779296.0000 Heat exchanger for boilers Jan. 9, 2015 (Year: 2015). |