Patent:GB191024662

Brevetto:	GB 191024662
Titolo:	Improvements in Day and Date Calculating Apparatus
Data:	02.02.1911
Luogo:
Nazione:	Gran Bretagna
Persona:	Evans, Walter Jenkin (P)
Ditta:
Link interni:	Datumsrechner
Keywords:
Link al brevetto: (without guarantee)	GB191024662

Aus der Patentschrift GB191024662

"Adding and subtracting apparatus. An instrument for use in ascertaining the number of days between any two dates &c." (aus der Patentschrift)

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