http://www.ncleg.net/enactedlegislation/statutes/html/bysection/chapter_14/gs_14-269.html
SUBCHAPTER IX. OFFENSES AGAINST THE PUBLIC PEACE.
Article 35.
Offenses Against the Public Peace.
"§ 14‑269. Carrying concealed weapons.
(a) It shall be unlawful for any person willfully and intentionally to carry concealed about his person any bowie knife, dirk, dagger, slung shot, loaded cane, metallic knuckles, razor, shurikin, stun gun,
or other deadly weapon of like kind, except when the person is on the person's own premises.
...
(d) This section does not apply to an ordinary pocket knife carried in a closed position. As used in this section, "ordinary pocket knife" means a small knife, designed for carrying in a pocket or purse, that has its cutting edge and point entirely enclosed by its handle, and that may
not be opened by a throwing, explosive, or
spring action."
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Autos are probably covered (and prohibited) by the "other deadly weapon of like kind" phrase in section a.
And 14-629 definitely applies to autos, via the "spring action" phrase in section d.
It even appears that assisted openers (as in Kershaw Speed Safe) might be
disallowed by the 'spring action' phrase in d.
Note that "other deadly weapon of like kind" and "spring action" are vague phrases, and therefore open to interpretation by police, judges, etc.
I found no reference to 'open carry',
but that does NOT mean it's OK.