installation, repair, and maintenance of lifts, elevators, and ramps; installation, repair, and maintenance of stair lifts, power-operated lifts, wheelchair lifts, scooter lifts, power chair lifts, personal mobility vehicle lifts, platform lifts, swimming pool lifts, and cargo lifts; installation, repair, and maintenance of dumbwaiters; installation, repair, and maintenance of wheelchair ramps, scooter ramps, power chair ramps, and personal mobility vehicle ramps; installation, repair, and ma...