| Napier's bones(noun, technology, entity, form, concept) |
| Odhner arithmometer(noun, technology, entity, form, concept) |
| Olav Tryggvason(noun, technology, entity, form, concept) |
| Oliver Typewriter Company typewriter(noun, technology, entity, form, concept) |
| Olivetti typewriter(noun, technology, entity, form, concept) |
| Pascal's calculator(noun, technology, entity, form, concept) |
| Peter Mitterhofer typewriter(noun, technology, entity, form, concept) |
| Pythagorean cup(noun, technology, entity, form, concept) |
| Quitsato sundial(noun, technology, entity, form, concept) |
| Ramsden surveying instrument(noun, technology, entity, form, concept) |
| Remington-Rand quiet-riter(noun, technology, entity, form, concept) |
| Royal Typewriter Company typewriter(noun, technology, entity, form, concept) |
| Scheutzian calculation engine(noun, technology, entity, form, concept) |
| Sholes and Glidden typewriter(noun, technology, entity, form, concept) |
| Slonimski's theorem(noun, technology, entity, form, concept) |
| Smith Corona typewriter(noun, technology, entity, form, concept) |
| Solar pyramid(noun, technology, entity, form, concept) |
| Solarium Augusti(noun, technology, entity, form, concept) |
| Sunquest sundial(noun, technology, entity, form, concept) |
| Sutton armillary(noun, technology, entity, form, concept) |