Rubik 5x5x5 "Professor"

Purchased from Rubik' 2006;
patented by U. Krell 1986.

(plastic, 2.75 inches)

Purchased from Mefferts 2007;
uses the Eastsheen mechanism.

(tiled plastic, 2.9 inches)

Mefferts "Mini Professor" 2007;
uses the Eastsheen mechanism.

(plastic, 2.3 inches)

Made by V-Cube 2008;
patent application by P. Verdes 2007.

(plastic, 2.5 inches)

Further reading:
Meffert's Page, from:
Jaap's Page, from:
McFarren's Page, from:
Monroe's Page, from:
Wikipedia Page, from:'s_Cube
Krell Patent, from: - patent no. 4,600,199
Li Patent, from: - patent no. 6,129,356
Verdes Patent Application, from: - patent application 2007/0057455