37 Construction of stage, studio, convention center and arena equipment and supplies, namely, rigging, curtains, electric distribution equipment, orchestra shells, acoustical ceilings, wall panels, and acoustical curtains, motorized acoustical ceilings, wall panels and acoustical curtains and controls, portable staging, modular staging and orchestra pit filler, motorized rigging and controls, lighting equipment, seating equipment; Installation of stage, studio, convention center and arena equipment and supplies, namely, rigging, curtains, electric distribution equipment, orchestra shells, acoustical ceilings, wall panels, and acoustical curtains, motorized acoustical ceilings, wall panels and acoustical curtains and controls, portable staging, modular staging and orchestra pit filler, motorized rigging and controls, lighting equipment, seating equipment; maintenance of venue-related rigging, staging, studio, orchestral, and acoustical equipment in the live performance staging, venues, centers, and facilities field