Aristo 958 Geodat Duplex
Click on the next link to see professional panoramic pictures of the 958 model
Click on the next link to see professional panoramic pictures of the 958 model
Aristo 958
https://www.sliderulemuseum.com/Aristo/Aristo_0958_GeoDat_360deg_dc641_GiftedByJamesJPennelCollection.jpg