Name | Issues/Designs | |||
ampulla | — | — | d - spoon & ampulla 1977 | |
Balance beam | — | — | d - Balance beam 1990 | |
Dish Aerial | — | — | d - Dish Aerial & modern telephone 1976 | |
letter | — | — | d - Mercury scattering letters over globe 1949 | |
musical instrument
subtype of manufacture |
— | — | d - musical instruments 1978 | |
radio | — | — | - 100th Anniversary of ... | |
Reflecting Telescope | — | — | d - Sir Isaac Newton and Reflecting Telescope 2000 | |
steam engine | 1790 | — | introduction d - James Watt and Drawing of steam engine 1987 | |
telephone | 1876 | — | invention - ... 100th d (2) - Alexander Graham Bell and telephones 1976, Dish Aerial & modern telephone 1976 |