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The industry then grew into the earliest corporate builders such as [[Brown & Sharpe]], the [[Warner & Swasey Company]], and the [[Pratt & Whitney Measurement Systems|original Pratt & Whitney company]]. In all of these cases, there were product manufacturers who started building machine tools to suit their own inhouse needs, and eventually found that machine tools had become product lines in their own right. (In cases such as B&S and P&W, they became the main or sole product lines.)
In contrast, [[Colt's Manufacturing Company|Colt]] and [[Ford Motor Company|Ford]] are good examples of product manufacturers that made significant advances in machine tool building while serving their own inhouse needs, but never became "machine tool builders" in the sense of having machine tools become the products that they sold. National-Acme was an example of a manufacturer and a machine tool builder merging into one company and selling both the machines and the products that they made ([[automatic lathe|screw machines]] and fasteners).<ref name="Rose1990pp564-565">{{Harvnb|Rose|1990}}, [
Until the 1970s, machine tool builder corporations could generally be said to have nationality, and thus it made sense to talk about an American machine tool builder, a German one, or a Japanese one. Since the 1970s, the industry has [[globalization|globalized]] to the point that assigning nationality to the corporations becomes progressively more meaningless as one travels down the timeline leading up to the present day; currently, most machine tool builders are (or are [[Subsidiary|subsidiaries]] of) [[multinational corporation]]s or [[Conglomerate (company)|conglomerates]]. With these companies it is enough to say "multinational corporation based in country X", "multinational corporation founded in country X", etc. Subcategories such as "American machine tool builders" or "Japanese machine tool builders" would be senseless because, for example, companies like [[Hardinge, Inc.|Hardinge]] and [[Yamazaki Mazak Corporation|Yamazaki Mazak]] today have significant operations in many countries.
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* {{Citation |last=Moore |first=Wayne R. |title=Foundations of Mechanical Accuracy |publisher=Moore Special Tool Co. |___location=Bridgeport, Connecticut, USA |year=1970 |edition=1st |lccn=73127307 }}.
* {{Noble1984}}
* {{citation | last = Roe | first = Joseph Wickham | title = English and American Tool Builders | publisher = Yale University Press | year = 1916 | ___location = New Haven, Connecticut | url =
* {{Roe1937}}
* {{Rolt1965}}
* {{Citation | last = Rose | first = William | year = 1990 | title = Cleveland: the making of a city | publisher = Kent State University Press | isbn = 978-0-87338-428-5 | url=
* {{Citation |last=Jerome |first=Harry |year= 1934 |title=Mechanization in Industry |publisher=US National Bureau of Economic Research |___location= Cambridge, Massachusetts, USA |url=http://www.nber.org/books/jero34-1 |postscript=.}}
* Ryder, Thomas and Son, ''Machines to Make Machines 1865 to 1968'', a centenary booklet, (Derby: Bemrose & Sons, 1968)
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