Upon evidence satisfactory to the commission that any owner or his residence is unknown or uncertain, the notice may be by publication; and if no appearance is entered for such owner, the commission shall, upon application by the public utility, appoint a guardian ad litem to represent such owner in the proceedings.
RSA 371:5
1929, 85:1. RL 294:5. 1951, 203:48 par. 5, eff. Sept. 1, 1951.