In 1960 the Lanston Monotype Machine Company of Washington, D.C. introduced the Monomatic composing machine, a typesetting system perpetuating the concept of a separate keyboard and caster interfaced by a 31-channel punched paper tape.
“The keyboard consisted of a two-alphabet layout (instead of the customary five or seven) augmented by four shift keys. In the caster, the matrix-case contained 324 characters arranged in 18 ¥ 18 rows. There were no restrictions on unit values within the rows.”
This was, presumably, the final evolution of the Monotype hot metal typesetting system.