Thread: Oldest Auto
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Old 25th June 2011, 04:08 PM   #9
David
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From the Wiki article:

"Switchblade knives date from the mid-18th century. The earliest known examples of spring-loaded blades were constructed by craftsmen in Europe, who developed an automatic folding spike bayonet for use on flintlock pistols and coach guns.[1] Museum examples dating from the 18th century are mostly English and French origin. These exclusive pieces were produced one at a time from wrought iron and not considered mass production knives. Handmade automatic knives of this era may not have makers' marks or tang stamps and are hard to date or catalog.[1] By 1790, combination pistol/spring dirks became standard products offered by gun makers.[1]"

http://en.wikipedia.org/wiki/Switchblade
The above info is cited to Mark Erikson's Antique American Switchblades.
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