Brevetti   Gran Bretagna  

Patent:GB155344

Brevetto:	GB 155344
Titolo:	Improved calculating device or slide rule
Data:	08.12.1920
Luogo:
Nazione:	Gran Bretagna
Persona:	Charles Herbert Booth
Ditta:	Halstead Best
Link interni:	Rechenschieber
Keywords:
Link al brevetto: (without guarantee)	GB155344

Aus der Patentschrift GB155344

• DATUM: 08.12.1920
• TITEL: Improved calculating device or slide rule
• PERSON: HALSTEAD BEST