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Patent:US1949706

Brevetto:	US 1949706
Titolo:	Manual clear signal device for adding machines
Data:	06.03.1934
Luogo:	Grand Rapids, USA
Nazione:	Stati Uniti
Persona:	Barrett, Glenn (P)
Ditta:	Portable Adding Machine Company
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Keywords:
Link al brevetto: (without guarantee)	US1949706 (espacenet),  US1949706 (uspto)

Aus der Patentschrift US1949706

• DATUM: 06.03.1934
• TITEL: Manual clear signal device for adding machines
• PERSON: PORTABLE ADDING MACHINE COMPAN