Sundial making tool
1690-1710
Sunshine recorder card form type 4511 N, template, 1920
1920
Template for porringer
Sunshine recorder card form type 4532, template, 1926
1926
Sunshine recorder card form type 4530, template, 1926
1926
Computer programme flowchart template, by IBM, 1965-1970
1965-1970
Computer programme flowchart template, by Autonomics, 1965-1970
1965-1970
Computer programme flowchart template, by Honeywell, 1965-1970
1965-1970