The rights and obligations of the corporation, except as to such tolls, shall not be affected by the sale, and they may redeem the franchise by paying to the purchaser the amount paid by him therefor, with twelve per cent interest thereon, at any time within three months after the sale.
RSA 528:14
RS 194:15. CS 207:15. GS 217:14. GL 236:14. PS 232:14. PL 344 :14. RL 400:14.