| Camera Maker | Canon | Camera Model | Canon EOS-1Ds Mark III |
| Aperture | f/3.5 | Exposure Value | 0 EV |
| Exposure Program | Manual | Exposure Time | 1/160 sec |
| Flash | No Flash | Focal Length | 32 mm |
| ISO | 100 | Metering Mode | Pattern |
| Date/Time | 2010:02:15 10:20:10 | Resolution Unit | Inch |
| X Resolution | 240 dots per ResolutionUnit | Y Resolution | 240 dots per ResolutionUnit |
| Exposure Mode | 1 | Keywords | travel United States of America United States America USA US California CA history historical historic historical marker famous landmark road side highway popular Place of Interest Places of Interest Tourist Attraction Tourist Attractions Tourist Destination Tourist Destinations Travel Destination Travel Destinations tour tourism tourist attraction destination Sign Signs American Day Daytime Historical Sites Vertical Education Historical Site Marker Markers Outdoor Outdoors Outside Road Road Signs Roadside Roadsign electronics research laboratory Federal Telegraph Company Cyril F. Elwell Lee de Forest radio vacuum tube electronics Palo Alto |
| Caption | PIONEER ELECTRONICS RESEARCH LABORATORY - This is the original site of the laboratory and factory of Federal Telegraph Company, founded in 1909 by Cyril F. Elwell. Here, Dr. Lee de Forest, inventor of the three-element radio vacuum tube, devised the first vacuum tube amplifier and oscillator in 1911-13. Worldwide developments based on this research led to modern radio communication, television, and the electronics age. California Registered Historical Landmark No. 836 Plaque placed by the State Department of Parks and Recreation in cooperation with the City of Palo Alto and the Palo Alto Historical Association, May 2, 1970 |