The advantage of transferring to the OEM vehicle seat for travel in a vehicle, rather than remaining in a wheelchair is that "transfer seats enable the wheelchair user to move from wheelchair with in center of a vehicle to the rear seat of a car."
OEM is an abbreviation for Original Equipment Manufacturer. Because the OEM is the original manufacturer of a vehicle's components, OEM car parts are similar to the parts used in the production of a vehicle.
Other vendors manufacture aftermarket parts, which may or may not be of consistent quality as well as compatibility with vehicle.
Some advantages of OEM vehicle seats are-
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