Regarding Different numbers

[Sunil Kumar]

 the following shows a patent by "Piramal Healthcare Ltd" . i need a suggestion regarding its different numbers like PN,AN and PR are different.
so i want to know whichever is earlier whether PN ,AN or PR?

________________________________________
       
PN : WO2009010908
KD : A2
PB : Jan 22, 2009
IN : HARIHARAN SIVARAMAKRISHNAN;CHAMBERS OWEN;UPARE ABHAY ATMARAM;SATAGOPAN DAMODHARAN
AP : PIRAMAL HEALTHCARE LTD;HARIHARAN SIVARAMAKRISHNAN;CHAMBERS OWEN;UPARE ABHAY ATMARAM;SATAGOPAN DAMODHARAN
AN : IB 200802008052801  Jul 11, 2008
IP :
TI : PROCESS FOR PRODUCTION OF 1,2,2,2-TETRAFLUOROETHYL DIFLUOROMETHYL ETHER (DESFLURANE)
CA :
PR : IN2007MU13432007    Jul 13, 2007

[nilkanth]

In chronological order....
 
PR (Priority application number) : IN2007MU13432007   Jul 13, 2007
AN (Application number) : PCT/IB2008/052801 on         Jul 11, 2008
PN (Publication number): WO2009010908 published on  Jan 22, 2009


fyi: access likn below
http://patentscope.wipo.int/search/en/detail.jsf?docId=WO2009010908&recNum=1&docAn=IB2008052801&queryString=WO:WO2009010908%20&maxRec=1