"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, chief engineer, British Post Office ; 1878
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| Application No. | Application Title | Issue Date |
| 20070079710 | Capacitive load driving circuit and method, liquid droplet ejection device, and piezoelectric speaker driving device There is provided a capacitive load driving circuit which applies a driving signal to a capacitive load. The driving circuit includes: an operational amplifier outputting a difference signal between signals from an inverting input terminal and a non-inverting input term... | 04/12/2007 |