Keuffel and Esser Paragon engineers ruler
1960
- Title
- Keuffel and Esser Paragon engineers ruler
- Collection
- Caltech Images Collection
- Series
- Scientific Instrument Photographs
- Identifier
- ST-GH-047
- Dates
- 1960
- Extents
- 1 photographs
- Abstract
- 12-inch, wooden, 30 & 60 scale.