AERONAUTICS. 29

no person shall be prosecuted, punished or subjected to any penalty or
forfeiture for or on account of any act, transaction, matter or thing con-
cerning which he shall, under oath, have, by order of the Commission or
a commissioner or its inspector or examiner, testified to or produced docu-
mentary evidence of; provided, however, that no person so testifying shall
be exempt from prosecution or punishment for any perjury committed
by him in his testimony.

1935, ch. 316, sec. 15D.

15D. In order to facilitate the making of investigations by the State
Aviation Commission, in the interest of the public safety and the promo-
tion of aeronautics, the public interest requires and it is therefore pro-
vided that the reports of investigations or hearings, or any part thereof,

or any testimony given thereat, shall not be admitted in evidence; or used
for any purpose in any suit, action, or proceeding growing out of any
matter referred to in said investigation, hearings, or report thereof, except
in case of criminal or other proceedings instituted by or in behalf of the
Commission under the provisions of this Act, nor shall any Commissioner
or employee of the State Aviation Commission be required to testify to
any facts ascertained in, or information gained by reason of, his official
capacity, and, further, no Commissioner or employee of the State Avia-
tion Commission shall be required to testify as an expert witness in any
. suit, action, or proceeding involving any aircraft.

1935, ch. 316, sec. 15E.

15E. It shall be the duty of the Commission, its members and em-
ployees, and every county and municipal officer charged with the enforce-
ment of State and municipal laws, to enforce, and assist in the enforce-
ment of this Act. The Commission is further authorized in the name of
the "The State of Maryland" to enforce the provisions of this Article by
injunction in the Equity Courts of this State. Other departments and
political sub-divisions of this State are further authorized to co-operate
with the State Aviation Commission in the development of aeronautics

and aeronautic facilities within the State.

1935, ch. 316, sec. 15F.

15F. Any person, firm or corporation being a party in interest and
feeling aggrieved by any action of the Commission in granting or refusing
to grant any license, may commence any action in the Circuit Court for
any County, or in any Court of Baltimore City of appropriate jurisdiction
which may be adapted for the purpose against the Commission as defend-
ant on the ground that such refusal or granting of such a license is unrea-
sonable, but such action must be commenced within thirty days after the
granting or refusal of such license by the said Commission.

The answer of the Commission to the complaint shall be served and
filed within 15 days after service of the complaint, whereupon said
action shall be at issue and stand ready for trial upon 15 days' notice
to either party.