Gilson

• Atlas Calculator Type 1 Version 1.5 – Square – MHF-501
• Atlas Calculator Type 2 – Binary – MHF-502
• Atlas Calculator Type 2 – MHF-503
• Atlas Slide Rule Type 3 – MHF-540
• Binary Type 1 – MHF-504
• Binary Type 2 – MHF-541
• Midget Type 2 Version 2 – MHF-505
• Midget Type 6 Version 1 – MHF-506

References for type classification:

Authors: Henry Aldinger and Ed Chamberlain
Title: Gilson Slide Rules – Part I – The Small Rules
Location: Journal of the Oughtred Society Vol. 9, No. 1, Spring 2000 Pg 48

Authors: Henry Aldinger and Ed Chamberlain
Title: Gilson Slide Rules – Part II – The Large Rules
Location: Journal of the Oughtred Society Vol. 9, No. 2, Fall 2000 Pg 47.