1) Inches per revolution 2) Intellectual property right 
the Institute for Public Relations, a US based independent non-profit foundation dedicated to the science beneath the art of public relations. →
Intellectual Property Rights - monopoly protection for creative works such as writing (copyright), inventions (patents), processes (trade secrets) and identifiers (trademarks).
Intellectual Property Rights
Intellectual Property Rights. Often applied to software (contrast open source), music, video and even algorithms (such as those for codec standards). Controlling IPR access through DRM (digital rights management) is increasingly important in the mobile context for both messaging, as in MMS, and streaming or real-time content become available.
Injector Pressure Regulator
acronym: Intellectual Property Right
Tracked Armoured Engineer Scout Vehicle optimised for river reconnaissance [SU]
inches per revolution.