Previous SC 510's:
1946 ROUTE LOG
SC 90: 0 - 0
US 501: 12.1 - 12.1
SC 917: 3.4 - 15.5
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SC 510: Appeared in 1940 as new primary routing, running from US 501 (now SC 319) Aynor south to SC 90 (now US 378) Pee Dee Crossroads.
In 1942, SC 510 was extended north as new primary routing to SC 917 (now S-26-23).
In 1947, SC 510 was downgraded to S-26-32 north of Aynor; S-26-21 and S-26-24 south of Aynor (now just S-26-24).
SC 510 appears out of Aynor
1940 Official
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SC 510 extended to SC 917
1942 Official
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