NC 109-A #1: Appeared about 1936 as new routing. Ran from NC 109 Cedar Lodge and ended at NC 109 in Thomasville.
In 1960, NC 109-A was renumbered as NC 109 Business. Today it is just Fisher Ferry Rd and a bit of Main St.
NC 109-A was shown but not labeled on official maps.

NC 109 always ran to the east 1930 Davidson County

NC 109-A appears in 1936 1936 Davidson County

NC 109 Bus replaces NC 109-A 1962 Davidson County

NC 109-A #2: Appeared between 1950-53 as a renumbering of NC 109. Followed Eldorado St, Smitherton St, N. Main St and W. Main St through Troy.
In 1960, NC 109-A became NC 109 Business which is now parts of NC 24-27 Bus, NC 134 and secondary routing.

NC 109 through Troy 1949 Montgomery County

NC 109-A through Troy 1953 Montgomery County

NC 109 Bus through Troy 1962 Montgomery County