You can own them, can't you? Just not carry?
C'mon guys, the OP posted the entire CODE!
IC 35-47-5-2
Knife with blade that opens automatically or may be propelled
Sec. 2. It is a Class B misdemeanor for a person to manufacture, possess, display, offer, sell, lend, give away, or purchase any knife with a blade that:
(1) opens automatically; or
(2) may be propelled;
by hand pressure applied to a button, device containing gas, spring, or other device in the handle of the knife.
As added by P.L.311-1983, SEC.32. Amended by P.L.70-2000, SEC.2.