Analysis of information sources in references of the Wikipedia article "헬리콥터 큐브" in Korean language version.
Helicopter Cube was designed and built by Adam G. Cowan (Puzzlemaster42) and Katsuhiko Okamoto (Katsuhiko) in 2007
The Helicopter Cube was conceived by Adam G. Cowan in 2005, but wasn’t built until 2006, when Adam discovered that 3D printing could be used to realize the parts.
Helicopter Cube black ... By Adam Cowan
The Curvy Copter is my most popular puzzle yet. It is a variation on Adam G. Cowan's Helicopter Cube.
The Helicopter Cube was conceived by Adam G. Cowan in 2005, but wasn’t built until 2006, when Adam discovered that 3D printing could be used to realize the parts.
Helicopter Cube was designed and built by Adam G. Cowan (Puzzlemaster42) and Katsuhiko Okamoto (Katsuhiko) in 2007
