Form iv contract labour act

Hai every one........... Any one plz reply.......... I am working in a company where we employ contract labour from 2 contractors. Contractor A-12 labour Contractor B-11 labour. Contractor A has in total 45 contract labour(including our company). Contractor A has not obtained Form IV.When we are asking to provide that, he is saying that as he is providing less than 20 labour to our company he is not bound to apply for Form IV under the act. Is he correct in his opinion? Also clarify me when a contractor has to apply and the limit in respect of labour for applying for Form IV. Is he required to file Form IV seperatly for each of the establishment he is providing the labour? What is the case if labour supplied falls below 20 to each company? Plz reply me back fast.......... Awaiting your reply...........