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WESTINGHOUSE, GEORGE, Jr., Inventor. Autograph letter signed ("Geo. Westinghouse Jr.") to Messrs. Clench & Nivens of St. Mary's, Ontario, Canada; Pittsburgh, 22 November l873, one page, 4to, in dark purple ink on decorative imprinted stationery of the Westinghouse Air Brake Company, a rare, early letter, only three years after the founding of his company: "Your favor...has just been placed before me for reply. The previous communications were received and referred to our Attorney, and we have been awaiting his examination of these patents. An examination will be made at a very early date....I thought it might be advisable for one of you gentlemen to visit Pittsburgh in relationto this matter, and we would be well pleased to have an interview with you on the subject...." MARCONI, GUGLIELMO, Inventor of radio. Autograph letter signed ("G. Marconi") to a Mrs. Tweedie, on board R.M.S. 'Olympic,' 4 June l913, 3 pages, 8vo, agreeing to a suggestion she has made, regretting his delay in replying "due to lawsuits and other things," and enthusing that "I am now really on my way to America...." -- EASTMAN, GEORGE, Inventor. Typed letter signed ("Geo. Eastman") to Frederick Colville, Rochester, N.Y., 30 June l902, 1 page, oblong 4to, on printed staionery of the Eastman Kodak Co., "Your letter...has been referred to me...and in reply I beg to say that we shall not have these [developing] machines on the market before the 1st of August. Regretting that we cannot send you one by the date mentioned...." -- BAIRD, JOHN LOGIE, Inventor of Television. Typed letter signed ("J.L. Baird") to Mrs. A. Tweedy, [London], 25 October 1929, 1 page, 4to, on imprinted stationery of the Baird Television Development Co., Ltd., arranging for his correspondent to witness a demonstration of his invention; Baird was the first to produce a televised picture of moving objects (transmitted from London to Glasgow in l927) and, in l928 had perfected color television -- LEAKEY, LOUIS S.B., Paleontologist, anthropologist. Typed letter signed ("LSB Leakey") to Mrs. Quiggin, St. John's College, Oxford, 25 September l934, 1 page, 4to, "...I think I can lend you some typical specimens of Clactonian, Levalloisian, Icenian and other implements, but not Cromerian, of which I regret to say I have no example at the moment. I am certain that you could get one or two...from Mr. Reid Moir...if you wrote...I cannot actually give you the specimens for the time being....I wonder if you have seen the special exhibition at the British Museum in which is a complete sequence of culture stages...I am very glad to hear that you propose to use [his book] Adam's Ancestors as a text book for your students. I am planing to follow it up with a sequel....but I am not sure when Eve's Offspring will appear. I shall be sailing for East Africa on October 24th." (5)