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  • Ruxton Multi-Vider drop-lead pencil & slide rule
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  • Makeba Kombinator pencil & slide rule
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  • For Calculating Strength of Liquids in Twaddells !!
  • PTT rule for Cable Radio (Signal Loss/dB)
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You searched for: AHREND (Wed. J. Ahrend & Zoon)
ModelTypeMaterialCommentsThumbnail
(P281) Demonstration Rietz wood/celluloid veneer

made by unknown 3rd party for Hemmi models P280/P281 - Rietz layout but all scales on front face

AHREND (Wed. J. Ahrend & Zoon) (P281) Demonstration Rietz
435660 (P280) Darmstadt-like plastic

OEM by HEMMI

AHREND (Wed. J. Ahrend & Zoon) 435660 (P280) Darmstadt-like
435661 (P281) Rietz plastic

OEM by HEMMI

AHREND (Wed. J. Ahrend & Zoon) 435661 (P281) Rietz
435662 (P283) Technical plastic

OEM by HEMMI

AHREND (Wed. J. Ahrend & Zoon) 435662 (P283) Technical
791/7 Diagonal Scale nickel silver

Used with a set of dividers for scale ratios 1:1000, 1:5000,1:1250 & 1:2500​

AHREND (Wed. J. Ahrend & Zoon) 791/7 Diagonal Scale
810 Diagonal Scale nickel silver

Used with a set of dividers for scale ratios 1:1000, 1:5000,1:1250 & 1:2500​

ELECTRO 15 Electro wood/celluloid veneers

OEM version made by KHH (5 slits in well + 5 adjustment screws on bottom side edge) but often mistaken as D&P because of model no. - V & W scales in well of stock + conversion tables (in NL) & 2 cursor windows in back - see also identical model sold by, Johann Faber, OHICO & Kahn Frères

AHREND (Wed. J. Ahrend & Zoon) ELECTRO 15 Electro
ELECTRO 654 Electro wood/celluloid veneers

OEM by KHH (5 slits in well + 5 adjustment screws on bottom side edge) & identical to Electro 15 model but possibly renumbered to avoid confusion with D&P model no. - V & W scales in well of stock + conversion tables (in NL) & 2 cursor windows in back

AHREND (Wed. J. Ahrend & Zoon) ELECTRO 654 Electro
HOLLANDIA-REKENSTOK Enhanced Mannheim wood/celluoid veneers

Hollandia-Rekenstok = Dutch calculating stick - OEM version by Dennert & Pape & 1st slide rule in Ahrend catalogue - cm scale in well of stock + conversion tables (in NL) on back

AHREND (Wed. J. Ahrend & Zoon) HOLLANDIA-REKENSTOK Enhanced Mannheim
NORMAL 650 (Ver. 1) Enhanced Mannheim wood/celluloid veneers

OEM by KHH (5 slits in well + 5 adjustment screws on bottom side edge) + conversion tables (in NL) & 2 cursor windows in back

NORMAL 650 (Ver. 2) Enhanced Mannheim wood/celluloid veneers

OEM by KHH (1 slit in well + 5 adjustment screws on bottom side edge) + conversion tables (in NL) & 2 cursor windows in back

RIETZ 652 Rietz wood/celluloid veneers

OEM by KHH (1 slit in well + 5 adjustment screws on bottom side edge) + conversion tables (in NL) & 2 cursor windows in back

AHREND (Wed. J. Ahrend & Zoon) RIETZ 652 Rietz