Dear Asnaik,
Your husband can apply in form 19 and 10 c after getting signature from a gazetted Officer or his Bank Manager and send the forms to concerned PF Office, in tern they can collect the required details from his ex-employer.
All he has to do is, fill up the known columns like his personal details,Date of Joining, Date of reliving, PF No. etc., and leave the unknown columns.
I am enclosing the above referred forms with filling up details.
All the best
S.Sethupathy,
Excellent HR Services,
Erode.