National Glass Company/Pittsburgh-PA (Company Operated: 1899-1904) -

  Notes: 1899-1904 Originally made up of 19 Factories designated by number:1)Beatty Brady (GW) 2) Canton GW 3) Central GW 4) Crystal GW 5) Cumberland GW 6) Dalzell Gilmore & Leighton GW 7) Fairmont GW 8) Greensburg GW 9)Indiana Tumbler & Goblet GW 10) Keystone GW 11) Model Flint GW 12) McKee & Bros GW 13) Northwood GW 14) Ohio Flint GW 15)Riverside GW 16) Robinson GW 17) Rochester GW 18) Royal GW 19) West Virginia GW Cambridge Glass Co, part of National, was built as a separate corporate entity.

Patterns by National Glass Company/Pittsburgh-PA (Company Operated: 1899-1904)
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