Brevetti   Gran Bretagna  

Patent:GB670031

Brevetto:	GB 670031
Titolo:	Improvements in electrical calculating apparatus
Data:	09.04.1952
Luogo:
Nazione:	Gran Bretagna
Persona:	Arthur Edward Roulston
Ditta:
Link interni:
Keywords:
Link al brevetto: (without guarantee)	GB670031

Aus der Patentschrift GB670031

• DATUM: 09.04.1952
• TITEL: Improvements in electrical calculating apparatus
• PERSON: ARTHUR EDWARD ROULSTON