Four sets of letter punches originally used by John Hadden and Co.
Three stages of hand cutting a letter punch
ICL 40 column tabulator/card summary punch
Lead Seal Punch
Forging punches
Hollerith card punch
1950-1965
Token punch and die. Royal Society
Finished Punch, Letter 'P', Part of Process of Hand Cutting a Punch, 1978
1978
Steel punch
Electric hand punch for 80 column cards manufactured by International Computers and Tabulators Ltd.
1965
Punch, Model 29
1965
Treadle paper punch by Hampson
Creed model 6S/5M Tape Punch
Sperry Univac 1810 Programmable 80 col Card Punch/Verifier/Reproducer/Interpreter Unit
1975
Hand gang punch
1904