Editing Utility knife (section)

==History==
The fixed-blade utility knife was developed some 500,000 years ago, when human ancestors began to make stone knives.<ref name="PET"/>  These knives were general-purpose tools, designed for cutting and shaping wooden implements, scraping hides, preparing food, and for other utilitarian purposes.<ref name="PET"/>

By the 19th century the fixed-blade utility knife had evolved into a steel-bladed outdoors field knife capable of butchering game, cutting wood, and preparing campfires and meals. With the invention of the backspring, pocket-size utility knives were introduced{{when|date=July 2012}} with folding blades and other folding tools designed to increase the utility of the overall design. The folding pocketknife and utility tool is typified by the ''Camper'' or ''Boy Scout'' pocketknife, the [[Swiss Army Knife]], and by [[multi-tool]]s fitted with knife blades.  The development of stronger locking blade mechanisms for folding knives&mdash;as with the Spanish [[navaja]], the [[Opinel]], and the [[Buck Knives|Buck 110 Folding Hunter]]{{citation needed|date=July 2012}}&mdash;significantly increased the utility of such knives when employed for heavy-duty tasks such as preparing game or cutting through dense or tough materials.