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Letter Quality Impact Printer Hammer Impressions

AT. Anthony

出版	ASTM International, 1988
URL	http://books.google.com.hk/books?id=SZR7zgEACAAJ&hl=&source=gbs_api

註釋

While acquiring typewriter standards, an unusual mark was encountered. Scrutiny of the mark and the electronic typewriter (ET) that produced it disclosed that the impression was a reproduction of the ET's hammer. This was the result of a missing character as a result of a broken spoke. Initially, it was thought that encountering such a mark would assist in the identification process. Subsequent examination of hammer marks from various manufacturers shows them to be highly distinguishable. Potential therefore exists for dating, classification, and make and model determinations when impressions of this type are present in typescript cases. Hammer marks from letter quality (LQ) impact printers are illustrated, and their value in case work is discussed.