| dioptra(noun, technology, entity, form, concept) |
| discontinued media format(noun, technology, entity, form, concept) |
| dividing engine(noun, technology, entity, form, concept) |
| dot matrix teletypewriter(noun, technology, entity, form, concept) |
| duplex locomotive(noun, technology, entity, form, concept) |
| early steam locomotive(noun, technology, entity, form, concept) |
| eight-track cartridge(noun, technology, entity, form, concept) |
| eight-track tape(noun, technology, entity, form, concept) |
| elcaset(noun, technology, entity, form, concept) |
| electric-steam locomotive(noun, technology, entity, form, concept) |
| electric typewriter(noun, technology, entity, form, concept) |
| electronic video recording(noun, technology, entity, form, concept) |
| electrophorus(noun, technology, entity, form, concept) |
| electroscope(noun, technology, entity, form, concept) |
| electrostatic generator(noun, technology, entity, form, concept) |
| elephant clock(noun, technology, entity, form, concept) |
| epicyclic gearing(noun, technology, entity, form, concept) |
| equation of time(noun, technology, entity, form, concept) |
| equatorial ring(noun, technology, entity, form, concept) |
| equatorium(noun, technology, entity, form, concept) |