Columbia subject headings:
Harvard subject headings:
Axe industry--United States--History.
Clocks and watches--United States--History.
Manufactures--United States--History--Case studies.
Manufacturing industries--United States--History--Case studies.
Manufacturing processes--United States--History.
Typewriter industry--United States--History.
Princeton subject headings:
Axe industry--United States--History.
Clocks and watches--United States--History.
Manufactures--United States--History--Case studies.
Manufacturing processes--United States--History.
Typewriter industry--United States--History.