There are 4 Bell 47D aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1947 and 1955.
N6521
1955 Bell 47D
Dickinson, TX
N6520
1954 Bell 47D
Dickinson, TX
N12888
1947 Bell 47D
San Jose, CA
N855E
Bell 47D
Anchorage, AK