§ 427. Officers and nurses. Every employer of persons for work in
compressed air shall:

1. Keep at the place of work at all necessary times one or more duly
qualified medical officers to care for cases of illness and to strictly
administer and enforce sections four hundred and twenty-six, four
hundred and twenty-eight and four hundred and twenty-nine.

2. Keep at a medical lock required by subdivision nine of section four
hundred and twenty-six a certified nurse selected by the medical officer
or officers required by subdivision one of this section and qualified to
give temporary relief in cases of illness.