M

Doors made primarily of metal, namely, horizontally bi-folding doors, vertically folding doors, single piece upward acting doors, hydraulic doors, swing-out doors, rolling doors, counter shutters, operating wall partitions, sliding doors, commercial doors, aircraft doors, hangar doors, farm doors, agriculture doors, industrial doors, and warehouse doors; and portable aircraft hangars primarily made of metal, namely, portable aircraft hangar buildings, portable plane storage structures, portable clear-span hangars, portable nested hangars, portable nested T-hangars, and portable T-hangars