Disentaglement Puzzles

Strings N Rings

This nicely crafted set was produced by Skor-Mor (part of their "Thinker" series). Each consists of strings and rings (of course).

Lariat Loop Puzzle Two-on-One Puzzle Ring-a-Ling Puzzle Horseshoe Puzzle
The object here is to simply remove the string from the wooden pieces. The object is to place both rings on the same side. Remove the center ring (and of course place it back). This is probably the most famous of the bunch.  The originals were made with real horseshoes.  The object is to remove the ring.