Thomas Edison obtained a patent for an electrographic vote recorder.
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| Number | Title | Issue Date |
| 4158889 | Calculator for calculating ax with the base a of any positive number by calculating common logarithm of a A calculator for calculating ax with the base a of an optional positive number comprises a first circuit for calculating log10 a. A multiplier calculates x.multidot.log10 a,which is separated into an integral part zi | 06/19/1979 |
| 4152774 | Programmable calculator including keyboard function means for raising the number ten to any designated power An adaptable programmable calculator is provided by employing modular read-write and read-only memory units capable of being expanded to provide the calculator with additional program and data storage functions oriented towards the environment of the user... | 05/01/1979 |