§ 26. Extension of lines. A telegraph corporation, a telephone
corporation or a telegraph and telephone corporation heretofore or
hereafter incorporated under or by any general or special law may
construct, own, use and maintain any line of electric telegraph or
telephone, whether or not the line and the territory in which it be
located was described in its original certificate of incorporation, and
whether wholly within or wholly or partly without the state, and may
join with any other corporation in constructing, leasing, owning, using
and maintaining such line, or hold or own any interest therein, or
become lessees thereof, upon delivering to the department of state for
filing a certificate of amendment. If the lines or territory are to be
extended the certificate shall describe the territory in which the
operations of the corporation are to be carried on.