Untamed I can find no hits using your key word "Lineraar" in Bladeforums or in Google. Shucks.
Here are links to photos of my Italian-made pick lock fish. The button operates the release to open and to close you must insert your fingernails underneath the lock near the pivot and pull it away from the knife so the blade can swing free and be pushed closed. The French were making automatics (Châtellerault) with pick locks in the 19th century. http://en.wikipedia.org/wiki/Switchblade
http://imageshack.com/a/img20/5461/l657.jpg
http://imageshack.com/a/img41/142/9xul.jpg
http://imageshack.com/a/img809/4585/pl3i.jpg
http://imageshack.com/a/img707/8384/gyf2.jpg
Woops! It's supposed to be "Lierenaar" (my bad!).
Sitflyer made an awesome post with very comprehensive info! He condensed all the best parts of this traditional folder.
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