Section 63K(1)(a) in The West Bengal Factories Rules, 1958
(a)For factories employing upto 50 workers.(i)the services of a Factory Medical Officer shall be available to carry out the pre-employment and post-employment periodical medical examination as stipulated under rule 63J and to render medical assistance as and when required;(ii)there shall be a minimum of 5 persons trained in first-aid procedures of whom at least one person shall always be available during the working hours; and(iii)there shall be fully equipped first-aid box for the use of the workers.