there are a lot more in the us patent database, but the following are quoting influence of pretty old technics. this "text reproducing apparatus" was brought to you by realty & industrial corporation. - haven't possible guessed that people still apply for patents for typewriters. especially didn't expect to see hewlett-packard in that list. they didn't get any patent on typewriters since 1969, but 33 in 2003 and 35 2004? (hp and compaq merge 2002. ¿panic in the labs?).

gubelmann's justifying text writing reproducing machine, 1975 holds a reference to 1909.

method and means for information presentation, 1974, gives credit to a patent accepted 1922.

[teaching (image/jpeg, 285 KB) ]
be it known that i, guy detrick, a citizen of the united states, residing at ada in the county of hardin and state of ohio, have invented new and useful improvements in charts for teaching universal history ...(pat 1.406.173, feb 14. 1922, filed 1920, [universalhistory (image/jpeg, 157 KB) ])