Antique Vintage Natl Cycle L.A. Auto-Bike Bicycle Rack - Bumper? Running Board? For Sale

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Antique Vintage Natl Cycle L.A. Auto-Bike Bicycle Rack - Bumper? Running Board?:
$995.00

For sale is a set of National Cycle Auto-bike L.A. bike rack arms. They have clamps at the bottom which likely clamped to a bumper or running board. I could not find any information on these or the company.
Thanks!