U.S. federal trademark · Serial No. 77211779 · Reg. No. 1181206
Apparatus and installations for ventilating, filtering, purifying, conditioning and directing air in underground roadway systems, namely, regulators for controlling air flow; filters for air conditioning; air filters being parts of industrial installations; flues; louvers controlling air flow for conditioning and ventilating installations; replacement parts for all of the aforementioned goods
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