Herdic
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Herdics are a type of horse-drawn carriage invented by Peter Herdic in 1881. The major improvements over previous types of carriages was in the springs, the way the body was mounted on the springs, and the manner in which the axles, springs, body, and shaft were connected. Herdics were designed as passenger vehicles, and, in particular, for use in public transportation. Their low entry made it easy for passengers to enter and exit the cars.
Herdics were soon adopted by numerous cities, including Philadelphia and Washington DC.