|
GB337673A
|
|
Improvements in or relating to spring washers and methods of making the same
|
|
DE544436C
|
|
Hand punch
|
|
GB328255A
|
|
Improvements in or relating to card perforating and other machines for recording upon cards
|
|
GB208844A
|
|
Improvements in and relating to loose-leaf files, binders and the like
|
|
DE394559C
|
|
Card sorting machine
|
|
DE367646C
|
|
Process and device for evaluating statistical information using punched payment cards
|
|
GB108942A
|
|
Improvements in and relating to Tabulating Machines.
|
|
CA344361A
|
|
Statistical calculating machine
|
|
CA344056A
|
|
Card record forming method
|
|
CA353655A
|
|
Statistical card analysing mechanism
|
|
CA235498A
|
|
Running total taking mechanism
|
