1060 LAWS OF MARYLAND. [CH. 553

1431. Said board shall have full power to revoke for
proper cause any license or renewal of same after a full
hearing of all parties in interest.

143J. Each license and renewal of same shall be in
force and effect only so long as an approved bond filed with
the said board in accordance with the provisions of this
sub-title shall remain in full force and effect, and every
such license or renewal of same shall become utterly void
and of no effect, should any such bond for any reason what-
soever become inoperative or ineffective, regardless of the
regular date of expiration of said certificate, license or re-
newal.

143K. Any and all persons granted a license or re-
newal of same shall display the same in a conspicuous place
in the office or place of business of such licensee.

143L. Nothing in this sub-title shall be construed to
prevent any person from doing or performing any of the
kinds of work enumerated in this sub-title, provided that
such work is performed under the direction and super-
vision of a duly licensed Master Electrician, but no such
work, other than minor electric repairs for the maintenance
of established plants, shall be performed excepting under
such direction and supervision of a duly licensed Master
Electrician, and the said licensed electrician shall be re-
sponsible for any and all work so done under his direction
and supervision.

143M. Any person, firm or corporation who shall prac-
tice or engage or continue in the work of a Master Elec-
trician without having complied with all the provisions of
this sub-title, and any person not licensed as Master Elec-
trician, who shall do or perform any such work except
under the direction of a Master Electrician, and any person
having been licensed as a Master Electrician and who shall
fail to renew his license as herein provided, and shall do
or perform any such work, or who shall violate any of the
provisions of this sub-title, shall be guilty of a misde-
meanor, and upon conviction thereof shall be sentenced to
pay a fine of not less than twenty-five dollars ($25. 00) nor
more than five hundred dollars ($500. 00) or to an impris-
onment not exceeding ninety (90) days, or both, in the
discretion of the court, and any such conviction shall ipso
facto revoke and annul any license that may have been
issued to such person.