Eco-Bra R.141
Eco-Bra R.143
Eco-Bra 1511
Eco-Bra Cosmos 1711
IWA 1640.
IWA 10159.
IWA (Ingenieurerburo fur Wirtschafliches Arbeiten), SR 722 Ma - IWA 0675, Wasserrohr-Rechner fur Druckwasser- und Abwasser Leitungen, Rohrreibung nach Colebrook. Water and Sewer Pipe Computer. 1974.
Meissner Fabrikat System Darmstadt.
Meissner Variant
Meissner VEB Galvanotechnik Leipzig
Reiss
Reiss Darmstadt
Reiss 3223 Progress
Reiss 3201 Rietz-Spezial
DR. Ing. Seehase Slide Rule.
Siemens and Halske Slide Rule.
Staedtler-Mars No.54403 Rietz.
Staedtler-Mars No.54455 Rietz-Scolaria. Based on the Nestler 251 Alpha but without the cm, Inch and Greek Alphabet.
Unknown Slide Rule purchased in Britain but maybe Koch Huxhold and Hannemann
Unknown Slide Rule purchased in Britain but maybe Koch Huxhold and Hannemann.
Unknown Slide Rule with similarities to the Veb Mantissa below, perhaps for Flow Injection Analysis but my knowledge of German is not good enough to work it out.
Veb Mantissa Multi, DDR.
Wichmann 474
