Section 10. Sections twenty-eight, thirty, thirty-six, thirty-seven, thirty-eight, thirty-nine and forty-one of the same Act, as amended, are hereby amended to read as follows:

"Sec. 28. Issuance of certificates. — The Board shall issue a certificate of registration upon payment of the registration fee as provided for in this Act, to any applicant who, in the opinion of the Board and after approval of his ratings by the Office of the President, has satisfactorily met all the requirements specified in this Act for the particular grade for which he is registering.

"All certificates of registration shall show the full name of the registrant, shall have a serial number, and shall be signed by all the members of the Board and the Commissioner of Civil Service, and shall be attested by the official seal.

"The issuance of a certificate of registration by the Board to a registrant shall be evidence that the person named therein is entitled to all the rights and privileges of a registered professional mechanical engineer, mechanical engineer, certified plant mechanical, as the case may be, while said certificate remains unrevoked or unsuspended.

"Sec. 30. Fees for examination and registration. — Every applicant for examination for the grade of professional mechanical engineer or mechanical engineer shall pay an examination fee of fifty pesos; and for the grade of certified plant mechanic, a fee of twenty pesos; which fee shall accompany the application.

"Every registrant for the grades of professional mechanical engineer and mechanical engineer shall pay a registration fee of ten pesos; and for certified plant mechanic, a fee of five pesos: Provided, That when an applicant is registered, without examination, for the grade of professional mechanical engineer or of mechanical engineer, he shall be required to pay a registration fee of thirty pesos; and for the grade of certified plant mechanic, a fee of ten pesos.

"Sec. 36. Field of action authorized for each grade; prohibitions. — It shall be unlawful for any person, unless exempted from registration under Section fourteen of this Act:

"(a) To be in responsible charge of the preparation of plans, designs, investigation, valuation, technical reports, specifications, or estimates, or to be in performance of other professional mechanical engineering service for any mechanical works, project or plant, either for himself or for others, unless he holds a valid certificate of registration as professional mechanical engineer.

"(b) To be in responsible charge of the construction, erection, installation or alteration or of the performance of mechanical engineering service in connection with the manufacture, sale, supply or distribution of any mechanical equipment, machinery or process for any mechanical works, project or plant, either for himself or for others, unless he holds a valid certificate of registration as professional mechanical engineer or mechanical engineer.

"(c) To operate, tend, or maintain, or be in charge of the operation, tending, or maintenance of any mechanical equipment, machinery or process for any mechanical works, project or plant of fifty horsepower or more but of less than three hundred horsepower, unless he holds a valid certificate of registration as professional mechanical engineer, mechanical engineer, or certified plant mechanic.

"(d) To operate, tend, or maintain, or be in charge of the operation, tending or maintenance of any mechanical equipment, machinery or process for any mechanical works, project or plant of three hundred horsepower or more, unless he holds a valid certificate of registration as professional mechanical engineer, or mechanical engineer.

"Sec. 37. Personnel required in mechanical plants. — Every mechanical works, project, or plant, in operation shall have not less than the following complement of resident engineers or mechanics duly registered under this Act:

"(a) Fifty horsepower or over but below three hundred horsepower, one certified plant mechanic, or one mechanical engineer of any rank: Provided, That every mechanical works, project or plant of fifty horsepower or over but below three hundred horsepower operating in more than one shift every twenty-four hours, shall have, in addition to the minimum personnel herein required, one certified plant mechanic or one mechanical engineer of any rank in charge or each and every additional shift.

"(b) Three hundred horsepower or over, one mechanical engineer or one professional mechanical engineer: Provided, That every mechanical works, projects or plants of three hundred horsepower or more shall have at least one resident mechanical engineer or professional mechanical engineer, in charge of each shift.

"Sec. 38. Preparation of plans and supervision of construction by registered engineers required. — It shall be unlawful for any person to order or otherwise cause the construction, erection, installation, or alteration of any mechanical equipment, machinery or process for any mechanical works, project or plant of fifty horsepower or more, unless designs, plans, layouts, and/or specifications have been prepared under the responsible charge of, signed and sealed by a registered professional mechanical engineer, and unless the construction, erection, installation, and/or alteration thereof are executed under the responsible charge and direct supervision of a registered professional mechanical engineer, a registered mechanical engineer, or a person exempt from registration under subsection (c) or (d) of Section fourteen of this Act.

"Sec. 39. Application to firms and corporations. — A firm or a co-partnership, or a corporation, or an association may engage in the practice of mechanical engineering in the Philippines, provided only that such practice is carried on by professional mechanical engineers, or mechanical engineers, or certified plants mechanics, holding valid certificates of registration issued by the Board.

"In the case of a firm, co-partnership, corporation, association, society or company, the manager, administrator, or the person who has charge of the management or administration of the business shall be held personally liable for any violation of this Act.

"Sec. 41. Roster of engineers and mechanics. — A roster showing the names and places of business of all registered professional mechanical engineers, mechanical engineers, or certified plant mechanics, shall be prepared by the Commissioner of Civil Service during the months of January and July of each year, commencing one year from the date this Act becomes effective. Copies of this roster shall be mailed to each person so registered, placed on file with the Board and copies furnished to all Department Heads, to the Mayors of all chartered cities, to the Director of Public Works, to such other bureaus, governmental agencies, and municipal and provincial authorities as may be deemed necessary, and to the public upon request."