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Koch, Huxhold & Hannemann (KHH) - made surprising System Korte slide rule that does addition & subtraction
Smallwood Folding Shoe Sizing Stick in metric for French shoe sizes 10-48 in increments of a Paris point (⅔ cm)
Lawrence MIT Antenna slide rule for radar antenna performance was classified during WWII by UK & US governments
ALRO-made ruler unusually with a cursor for analysing ECG printouts of the cardiac Sinus Rhythms
Hatters Gauge - for measuring the size of a hat but unusually calibrated in metric & imperial
Glovers Rule - for measuring the length of a glove in imperial inches
Unusual non-logarithmic QR 41 military model by Dennert & Pape (D&P) for training anti-aircraft gunners
Colour combinations slide rule made by German WH-Wohnen for Interior Designers
Professor Fuller’s Drum Calculator from 1878 - made by W.F. Stanley
Modern wristwatch with slide rule bezel calculator made by German maker Kienzle
Ruxton made Multi-Vider combined drop-lead pencil & slide rule
Rare Otis King Model N for Retail & Monetary with white scales (422 & 424) on a black background
Darnley’s Rotable Lightning Calculator/Pencil Case calculating aid
Makeba made Kombinator combination pencil & slide rule
Rare Carbic-made Fischer Calculator slide rule
Specialist slide rule for a national home cable radio broadcasting system offered in The Netherlands from 1930 to1970
Smallest drum (≈ 2.4m) made by renowned Swiss maker LOGA

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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.
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Search results: Click on any Model listed in the leftmost column (or its image) for the full specification OR hover over its "Thumbnail" image (if shown) for a pop-up enlargement

You searched for: DIWA (Dansk Industri Waterpas A/S )

Model	Type	Material	Comments	Thumbnail
1-1 Rietz-Ideal	Rietz	plastic	Called Ideal because full complement of Trig scales included on front face
101 Log Log	Log-Log	wood/celluloid veneers	Veneers attached with screws/pins + table of conversion factors on back with 1 cursor window
201 Technical (ver.1)	Rietz	wood/celluloid veneers	Veneers attached with screws/pins + table of conversion factors on back with 1 cursor window
201 Technical (ver.2)	Rietz	wood/celluloid veneers	Veneers attached with screws/pins + table of conversion factors on back with 1 cursor window
301 Commercial	Enhanced Mannheim	wood/celluloid veneers	Veneers attached with screws/pins + table of conversion factors on back with 2 cursor windows
301 Rietz	Rietz	wood/plastic veneers	Table of conversion factors on back with 1 cursor window
501 Rietz	Rietz	plastic	1 cursor window in back
551	Darmstadt	plastic	Unusual layout
601	Pocket Promotional Rietz	plastic	Version of 621 but primarily a model for a promotional slide rule - in this case for Danish supplier of light-weight concrete SIPOREX + company details on back with 1 cursor window
601-1	Pocket Rietz	plastic	Later version of 601 + 1 cursor window in back
611	Pocket Electro	plastic	V and W scales in the well of the stock + 1 cursor window in back
621 Technical	Pocket Rietz	plastic	1 cursor window in back
631 Commercial	Pocket Enhanced Mannheim	plastic	Specially commissioned by Swedish company Elektromekano & printed on back + 1 cursor window in back
701	Rietz	plastic	A “cheaper” model (all scales on front face) for schools + inch scale “upside down”
710 Teknilog	Technical	plastic	Impressive complement of scales but possible OEM by Japanese maker Ushida Yoko
741 Businessman Export	Technical two-tone	plastic	From construction, two-tone nature, scale layout, & cm + inch scale on back OEM by Japanese maker Ushida Yoko