It shall be the duty of every employer to furnish his employees in any locality with free medical and dental attendance and facilities consisting of:
(a) The services of a full-time registered nurse when the number of employees exceeds fifty (50) but not more than two hundred (200) except when the employer does not maintain hazardous workplaces, in which case, the services of a graduate first-aider shall be provided for the protection of workers, where no registered nurse is available. The Secretary of Labor and Employment shall provide by appropriate regulations the services that shall be required where the number of employees does not exceed fifty (50) and shall determine by appropriate order, hazardous workplaces for purposes of this Article;
(b) The services of a full-time registered nurse, a part-time physician and dentist, and an emergency clinic, when the number of employees exceeds two hundred (200) but not more than three hundred (300); and
(c) The services of a full-time physician, dentist and a full-time registered nurse as well as a dental clinic and an infirmary or emergency hospital with one bed capacity for every one hundred (100) employees when the number of employees exceeds three hundred (300).
In cases of hazardous workplaces, no employer shall engage the services of a physician or a dentist who cannot stay in the premises of the establishment for at least two (2) hours, in the case of those engaged on part-time basis, and not less than eight (8) hours, in the case of those employed on full-time basis. Where the undertaking is non-hazardous in nature, the physician and dentist may be engaged on retained basis, subject to such regulations as the Secretary of Labor and Employment may prescribe to insure immediate availability of medical and dental treatment and attendance in case of emergency.