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The following definitions are taken from the ITSDF, B56.1-2005 publication, SAFETY STANDARD FOR LOW LIFT AND HIGH LIFT TRUCKS, Part IV, Glossary of Commonly Used Words and Phrases. (pages 49 - 56)

"truck, powered industrial: a mobile power propelled truck
used to carry, push, pull, lift, stack, or tier material." (page 54)

"truck, forklift: a self-loading truck, equipped with load
carriage and forks for transporting and tiering loads." (page 51)

"truck, counterbalanced: a truck equipped with load-engaging
means wherein all the load during normal transporting is external to the polygon formed by the wheel contacts." (page 51)

You can download a free copy of this and other INDUSTRIAL TRUCK STANDARDS DEVELOPMENT FOUNDATION consensus standards. Google: ITSDF.ORG.