Patent:GB191210855
Brevetto: | GB 191210855 |
Titolo: | Improvements in Date Calculating Devices |
Data: | 28.11.1912 |
Luogo: | |
Nazione: | Gran Bretagna |
Persona: | Kerr David Smith |
Ditta: | |
Link interni: | Datumsrechner |
Keywords: | |
Link al brevetto: (without guarantee) | GB191210855 |


Aus der Patentschrift GB191210855
"Adding and subtracting apparatus. For calculating dates, a wooden or other base has two grooves and is divided on back, front, and ends into 365 parts numbered from unity in each direction. In each groove slides a strip also divided into 365 parts and inscribed one, 13, with the month and days of the month, the other, 14, with the days of the week. " (aus der Patentschrift)
- DATUM: 28.11.1912
- TITEL: Improvements in Date Calculating Devices.
- PERSON: KERR DAVID SMITH CA