printing key frame
now historical
noun
A typewriter for producing embossed type, designed for use by blind people.
- The device was patented by Pierre Foucault in 1849 and was exhibited in London at the Great Exhibition of 1851..
Origin
Mid 19th century.
- undermine
- underminer
- undermost
- underneath
- undernourished
- undernourishment
- undernutrition
- underoccupancy
- under one's arm
- under one's belt
- under one's breath
- under one's feet
- under one's own steam
- under one's wing
- under (or in) no circumstances
- under (or in) the circumstances
- under (or on) oath
- under (or on) penalty of
- underpaid
- underpainting
- underpants
- underpart
- underpass
- underpay
- underpayment