"Writing by Machinery", Milwaukee Daily Sentinel, Vol.26, No.236 (October 6, 1869),p.1, l.4).
http://yasuoka.blogspot.com/2006/09/to-improve-usefulness-of-typewriters.html
posted by Koichi Yasuoka at 11:46 PM
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posted by Koichi Yasuoka at 10:21 PM on Sep 29, 2006 ?
In 1868, Mr. Christopher Latham Sholes' Type Writer was adopted by Porter's Telegraph College, Chicago. It was his second model and, being different from his first model, it had a piano-like two-row keyboard (shown below, taken from U. S. Patent No.79265). It had twenty-eight keys, thus it could print capital letters (A to Z), comma and period, but not numerals (cf. "Writing by Machinery", Milwaukee Daily Sentinel, Vol.26, No.236 (October 6, 1869), p.1, l.4).