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- NASDAQ Stock Market
- Nation Penn / Pan Asia Bank
- National Association of Home Builders
(NAHB)
- NC State University
- NeighborCare
- Neose Technologies
- New York City Technology Center
- New York State Police
- News & Observer
- Nextran Inc.
- Noble and Greenough
- North American Vaccine
- North Carolina State University
- Northern Michigan University
- Northern Virginia Community College
- NovaCare
- Novartis
- Novavax, Inc.
- Novo Nordisk
- Noxell Corporation
- NP Studios
-
- Oberlin College
- Oliver Tyrone Pulver Corp.
- Organon Inc.
- Ortho Pharmaceuticals Inc.
- Otsuka America Pharmaceuticals, Inc.
- Ottens Flavors
- Oxirane Corporation
-
- Paine Webber
- Pennsylvania State University
- Pennsylvania Power & Light (PP&L)
- Pepper Hamilton LLP
- Perks Reutter Associates
- PF Laboratories
- Pfizer, Inc.
- Philadelphia Gas Works
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- Philadelphia Newspapers Inc.
- Philadelphia Savings Fund Society
- Philadelphia School District
- PJM Interconnection
- PLIVA Inc.
- PNC Bank, N.A.
- Polaroid
- Preferred Real Estate Advisors, Inc.
- Princeton University
- Printpack
- Proskauer Rose, LLP
- Prudential Insurance Co., of America
- Prudential Properties
- PTC Therapeutics
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- Radnor Corporation
- Raytheon
- Reality Online, Inc.
- Recigno Laboratories, Inc.
- Regeneron
- Reliance Insurance
- Reit Management
- Rembrandt IP Management, LLC
- Rhodes Homes
- Rhodia, Inc.
- Roche Pharmaceuticals
- Rochester Institute of Technology
- Rockefeller Group
- Rockefeller University
- Rodin Enterprises Inc.
- RohMax USA, Inc.
- Rohm and Haas Company
- Ronald Reagan Presidential Library Foundation
- Roxane Laboratories Inc.
- Rubenstein Company, LP
- Rutgers State University
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