Section 145(8) in The Coal Mines Regulations, 2011
(8)The competent persons shall after carrying Put the inspection under sub-regulation (7), place his signature, with date, on a check-board provided for the purpose at a suitable position on the stopping and which shall be maintained for a period of not less than three months, and a report of every such inspection shall also be recorded in a bound paged book kept for the purpose duly signed and dated by the person making the inspection:Provided that the Regional Inspector may, by an order in writing, require the inspection of stoppings to be made at such shorten intervals as he may specify therein.