Patents   USA  

Patent:US2390441

Patent:	US 2390441
Title:	Adding and subtracting mechanism
Date:	04.12.1945
Place:
Country:	USA
Person:	Hall Keen Harold, Oliver Wright Thomas
Company:	IBM (P)
Internal Links:
Keywords:
Link to the patent office: (without guarantee)	US2390441 (espacenet),  US2390441 (uspto)

Aus der Patentschrift US2390441

• DATUM: 04.12.1945
• TITEL: Adding and subtracting mechanism