ART. 23] TELEGRAPH AND TELEPHONE COMPANIES. 753

such other facts pertaining to the operation and maintenance of the
plant and system, and the affairs of such person or corporation, as, may
be required by the commission. Such reports shall be in the form,
cover the period and be submitted at the time prescribed by the commis-
sion. The commission may, from time to time, make changes and addi-
tions in such forms, giving to the persons and corporations three months'
notice before the time fixed by the commission as the expiration of the
fiscal year of any changes or addition which would require any altera-
tion in the method or form of keeping their accounts for ensuing year.
When any such report is defective, or believed to be erroneous, the com-
mission shall notify the person or corporation making such report to
amend the same within thirty days. Any such person or corporation
which shall neglect to make any such report within the time specified
by the commission, or which shall fail to correct any such report within
fifteen days after notice, shall be liable to a penalty of one hundred
dollars and an additional penalty of ten dollars for each day after the
prescribed time for which it shall neglect to file or correct the same, to
be sued for in the name of this State. The amount recovered in such
action shall be paid into the State treasury and be credited to the general
fund. The commission may extend the time herein limited for cause
shown.

Shall have power, either through its members or inspectors or
employees duly authorized by it, to enter in or upon and to inspect the
property, buildings, plants, factories, power-houses and offices of any
such corporations or persons.

Shall have power to examine the books and affairs of any such corpo-
ration or person, and to compel the production before it of books and
papers pertaining to the affairs being investigated by it.

Shall have plenary power to make all valuations of the lines, property,
plant, franchises and assets of such corporations.

1910, ch. 180, sec. 40 (p. 386).

454. Every telegraph company or telephone company within the
jurisdiction of this commission shall provide such service and facilities
as shall be adequate, just and reasonable. All rates, tolls and charges
used, made or demanded by any such telegraph company or telephone
company for any telegraphic or telephonic communication or service
shall be just and reasonable and not more than, allowed by law or by
order of the commission and made as authorized by this sub-title.

No telegraph or telephone company shall make or give any unjust or
undue preference, or advantage in rates charged or demanded, or in
any other respect whatsoever, or subject any particular person, corpora-
tion or locality to any unfair prejudice or disadvantage, but shall furnish
equal facilities to their patrons and transmit all messages in the order
in which they are received.

It shall be the duty of the commission to require that every telephone
company, so far as it operates its lines and conducts its business in
the State of Maryland, to furnish to its patrons reasonably good and
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