U.S. federal trademark · Serial No. 77208901 · Reg. No. 3394419
Manually operated guillotine dampers that have a sealing mechanism for a sliding damper plate and are used industrially to control gas flow in a duct, and parts therefore
Automatically activated guillotine dampers that have a sealing mechanism for a sliding damper plate and are used industrially to control gas flow in a duct, and parts therefor
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