Carrier must secure commission approval before adding different type of equipment as proviso in sub. (d) applies only to adding authorized type. Att. Gen. Op. 62-37.

Grandfather clause, issuance of certificates thereunder. Att. Gen. Op. 62-51.

Commission's findings under subsection (c) of public convenience and necessity and of applicant's fitness must be supported by substantial evidence. 55 H. 463, 522 P.2d 1272.