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BTM vertical sorter c. 1911 ICT Museum No.33

BTM vertical sorter, 1911.

1911
BTM vertical sorter c. 1911 ICT Museum No.33

BTM vertical sorter, 1911.

1911
Metal stairs containing punched cards for BTM vertical sorter c. 1911 ICT Museum No.33

Punched cards for BTM vertical sorter, 1911

1911
Envelope containing punched cards for BTM vertical sorter c. 1911 ICT Museum No.33

Punched cards for BTM vertical sorter, 1911

1911