GB362529A
(en )
1931-12-10
Improvements in or relating to punching machines for perforating statistical record cards
GB683691A
(enrdf_load_stackoverflow )
US1950476A
(en )
1934-03-13
Card perforating machine
GB745482A
(en )
1956-02-29
Key-controlled perforating machines
US2025764A
(en )
1935-12-31
Record card controlled machine
GB617358A
(en )
1949-02-04
Improvements in or relating to machines used in perforating cards for use in statistical machines
US2877081A
(en )
1959-03-10
Card positioning means
GB710928A
(en )
1954-06-23
Improvements in or relating to record card punching machines
US3095141A
(en )
1963-06-25
Data handling mechanism
US2228464A
(en )
1941-01-14
Sheet perforating device
US3494051A
(en )
1970-02-10
Keyboard apparatus for teaching machine
US3737915A
(en )
1973-06-05
Apparatus for automatic recording of successive measurements such as bowling pin status
US2346263A
(en )
1944-04-11
Card punching machine
GB224290A
(enrdf_load_stackoverflow )
US2969432A
(en )
1961-01-24
Non-interfering tape feed-out mechanism
US1844811A
(en )
1932-02-09
Card perforating machine or the like
GB238553A
(en )
1926-11-15
Improvements in or relating to apparatus for perforating sheet material
US1182179A
(en )
1916-05-09
Perforator for forming telegraphic tape.
GB754648A
(en )
1956-08-08
Tape perforating machines
US1983154A
(en )
1934-12-04
Keyboard operated machine
US1807627A
(en )
1931-06-02
Carriage return for punching machines
US3327940A
(en )
1967-06-27
Automatic card notcher
US2786412A
(en )
1957-03-26
Record card controlled statistical machines
GB558793A
(en )
1944-01-21
Improvements in or relating to printing machines
GB595939A
(en )
1947-12-23
Improvements in or relating to statistical card punching machines