Interested in finding out more out about such calculating wonders?
Then try one of the slide rule related articles (often light-hearted) I have published.
Go to the search papers page.
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Use/purpose of the many gauge marks is unknown - SR built into desktop stand for Nederlandse Kabelfabriek (NKF - Dutch cable factory in Delft)
Possibly a basic model for other specially commissioned designs but use/purpose of the many gauge marks is unknown - SR built into desktop stand
Commissioned by Coöperatieve Condensfabriek Friesland (CCF a Dutch dairy specialising in condensed milk) - for checking the waybills for shipping/tranporting goods