![]() |
This is a rare Albert Nestler early Mannheim slide rule no.9 with...
![]() |
Adix is a relatively simple column adder for adding numbers up...
![]() |
This almost new Planimeter is a Polar type integrating machine...
![]() |
This is a circular side rule made of German silver and glass by...
![]() |
This Planimeter is a Polar type integrating machine that was made...
![]() |
This Planimeter is a Polar type integrating machine that was made...
![]() |
Fowler & Co. in Manchester made this pocket calculator during the...
![]() |
W.F Stanley area computing scale for calculating the area in acres...
![]() |
Otis King Slide Rule Calculator Model 'K'. Otis King is a cylindrical...