There is a great feature at Gizmodo.com with photos and information about the “souped up” Swiss Army knife used by Steve Carrel as Maxwell Smart in Get Smart – see “Get Smart’s Swiss Army Knife Has Working Crossbow, Flamethrower and Blowgun“.
Gizmodo got the full spec illustration from propmaster Tim Wiles (thumbnails below, full res from link above).
Per the story:
In Hollywood, the same rule that applies to babies and cars applies to key props: There has to be more than one. In the shooting of Get Smart, there were a total of seven functional Swiss Army knives, three with working crossbows, and two each with working flamethrowers and blowguns. There were also a dozen or so rubber versions for shots where the knife flies through the air or takes some other kind of a beating.
Here are thumbnails of the illustrations that can be viewed in high resolution at Gizmodo.com:
Jason De Bord