US3219060A
(en )
1965-11-23
Hydraulic amplification with hydraulic feedback
GB709190A
(enExample )
US3225346A
(en )
1965-12-21
Binary input servomechanism
US2119841A
(en )
1938-06-07
Totalizer engagement control device
US3215159A
(en )
1965-11-02
Pressure drop regulator
US3384301A
(en )
1968-05-21
Plus and minus accumulator
US2584864A
(en )
1952-02-05
Accounting machine
GB709188A
(enExample )
US3161354A
(en )
1964-12-15
Tabulation control mechanism for accounting machines
Rogers
2023
Early educators around the world feel burnt out and devalued. Here's how we can help
US2238508A
(en )
1941-04-15
Cash register
US1857356A
(en )
1932-05-10
Calculating and listing machine
GB907591A
(enExample )
US2258697A
(en )
1941-10-14
Bookkeeping machine
US3652010A
(en )
1972-03-28
Totalizer control mechanism
GB612392A
(en )
1948-11-11
Improvements in or relating to accounting machines and similar calculating machines
GB442538A
(enExample )
GB737050A
(en )
1955-09-21
Computing machine
US2291949A
(en )
1942-08-04
Listing adding machine
GB697928A
(enExample )
1900-01-01
Kershaw
2006
Negative Transfer in the Learning of Typing Tasks
Liebert
1970
Real-time simulation of dynamical systems on a small digital computer
GB223301A
(enExample )
GB508141A
(enExample )
GB253734A
(enExample )