#1 http://www.buck-184.com/
Regarding the grappling hooks, these are described it the patent which CAN BE SEEN HERE. In brief, the patent discusses the attachment of the grapples to the quillon with sufficient strength to support a load of 600 pounds and reference is made to a casting line. With this said, it is generally accepted that using the knife as a grappling hook, which implies the act of tying a rope to the pommel and throwing the knife, could be very hazardous! In fact, the last of the BUCKMASTER knives came with small flyers saying that using the knife as a grappling hook would void the warranty. A better use of these hooks are as anchor pins where knife can be wedged in some rocks or the crotch of a tree and used with a securing line off the lanyard loop attached to the hollow handle cap/pommel.
The knife was originally intended for SEALs, as in navy frogmen. The anchors would have been used primarily to hold the diver in place while in the water.