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Although the mail sorting machine was eventually broken up for scrap, it was highly influential outside of Canada. Lewis' original suggestion that some sort of invisible or see-through ink be used to store routing information on the front face of the letters is now practically universal, as is the basic workflow of the address being converted to [[bar code]] form as soon as possible by typists and then sent into automated machinery for actual sorting.<ref>"Mail-sorting system reads typed addresses", ''Electronics'', Volume 51 (1978), pg. 61</ref><ref>"Mail Sorting", ''Product Engineering'', Volume 39 (1968), pg. 67</ref> Use of bar-coded ZIP codes printed directly at the sending point when using [[postage meter]]s became mandatory in the U.S. in 1973.<ref>"Code of Federal regulations", U.S. Federal Register Division, 1974, pg. 191</ref> During the 1960s the use of [[optical character reader]]s replaced typists for letters with typewritten addresses, and in the 1990s, handwriten ones as well.
Ferranti prospered from the
==See also==
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