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EXHIBIT31.2
SARBANES-OXLEYSECTION302CERTIFICATION
I,NicholasC.Gangestad,certifythat:
1.IhavereviewedthisannualreportonForm10-Kof3MCompany;
2.Basedonmyknowledge,thisreportdoesnotcontainanyuntruestatementofamaterialfactoromittostateamaterialfact
necessarytomakethestatementsmade,inlightofthecircumstancesunderwhichsuchstatementsweremade,not
misleadingwithrespecttotheperiodcoveredbythisreport;
3.Basedonmyknowledge,thefinancialstatements,andotherfinancialinformationincludedinthisreport,fairlypresentin
allmaterialrespectsthefinancialcondition,resultsofoperationsandcashflowsoftheRegistrantasof,andfor,theperiods
presentedinthisreport;
4.TheRegistrant’sothercertifyingofficerandIareresponsibleforestablishingandmaintainingdisclosurecontrolsand
procedures(asdefinedinExchangeActRules13a-15(e)and15d-15(e))andinternalcontroloverfinancialreporting(as
definedinExchangeActRules13a-15(f)and15d-15(f))fortheRegistrantandhave:
(a)Designedsuchdisclosurecontrolsandprocedures,orcausedsuchdisclosurecontrolsandprocedurestobe
designedunderoursupervision,toensurethatmaterialinformationrelatingtotheRegistrant,includingits
consolidatedsubsidiaries,ismadeknowntousbyotherswithinthoseentities,particularlyduringtheperiodin
whichthisreportisbeingprepared;
(b)Designedsuchinternalcontroloverfinancialreporting,orcausedsuchinternalcontroloverfinancialreportingto
bedesignedunderoursupervision,toprovidereasonableassuranceregardingthereliabilityoffinancialreporting
andthepreparationoffinancialstatementsforexternalpurposesinaccordancewithgenerallyacceptedaccounting
principles;
(c)EvaluatedtheeffectivenessoftheRegistrant’sdisclosurecontrolsandproceduresandpresentedinthisreportour
conclusionsabouttheeffectivenessofthedisclosurecontrolsandprocedures,asoftheendoftheperiodcovered
bythisreportbasedonsuchevaluation;and
(d)DisclosedinthisreportanychangeintheRegistrant’sinternalcontroloverfinancialreportingthatoccurred
duringtheRegistrant’smostrecentfiscalquarter(theRegistrant’sfourthfiscalquarterinthecaseofanannual
report)thathasmateriallyaffected,orisreasonablylikelytomateriallyaffect,theRegistrant’sinternalcontrol
overfinancialreporting;and
5.TheRegistrant’sothercertifyingofficerandIhavedisclosed,basedonourmostrecentevaluationofinternalcontrolover
financialreporting,totheRegistrant’sauditorsandtheauditcommitteeoftheRegistrant’sboardofdirectors(orpersons
performingtheequivalentfunctions):
(a)Allsignificantdeficienciesandmaterialweaknessesinthedesignoroperationofinternalcontroloverfinancial
reportingwhicharereasonablylikelytoadverselyaffecttheRegistrant’sabilitytorecord,process,summarizeand
reportfinancialinformation;and
(b)Anyfraud,whetherornotmaterial,thatinvolvesmanagementorotheremployeeswhohaveasignificantrolein
theRegistrant’sinternalcontroloverfinancialreporting.
/s/NicholasC.Gangestad 
NicholasC.Gangestad
ChiefFinancialOfficer 
February11,2016
EXHIBIT32.1