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Type | Model No. | Maker | Country | Construction Material | Date | Scale Length | Area of Use |
Linear | 1491 | IWA | Germany | Plastic | c 1974 | 19 cm | Beer Industry |
Notes: "A slide rule used to calculate the complex processes involved in making beer, includes a case with German instructions "
Image 1
![](iwa/images/107a.jpg)
Image 2
![](iwa/images/107b.jpg)
Image 3
![](iwa/images/107c.jpg)
Image 4
![](iwa/images/107d.jpg)