may select the license of your choice. English Pickett model N4ES Log-Log Vector Hyperbolic slide rule, reverse side URL: https://commons.wikimedia...
Alike 4.0 truetrue English Picket model N4-ES Log-Log Vector Hyperbolic slide rule, front side author name string: ArnoldReinhold Wikimedia username: ArnoldReinhold...
BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English Pickett N4ES front with case author name string: ArnoldReinhold Wikimedia username:...
BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English Pickett N4ES back with case author name string: ArnoldReinhold Wikimedia username:...
