of the Institution at which he is registered, the copies of pay rolls or contribution schedules referred to in rule 4 (1), within fifteen('The word "fifteen" was substituted by "thirty" by Punjab Govt. Noti. No. 1116 LabII) 66 of 29 March 1975. Pb. Gaz. Extr. May 13, 1975, p. 697: In Sindh the words "within thirty days at the end of each mont...