Ad Agencies
 O'Keeffes Commns. P. Ltd.  Oberoi Multimedia Limited.
 On Dot Advertising  ONE advertising & communication services ltd.
 Onus Communications  Opal Advtg. & Mktg.
 Opus CDM (Orca CDM)  Orange Ads
 Orchard Advertising P. Ltd.  Origin/Beantsalk Creative Consultants
 Overture Commn. P. Ltd.  Oxygen Communications Pvt. Ltd.
 
 
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