Columbia subject headings:
Harvard subject headings:
Industries--Social aspects--Germany--History--20th century.
Siemens Aktiengesellschaft--History--20th century.
Siemens Aktiengesellschaft--Social planning.
Siemens Aktiengesellschaft.
Social responsibility of business--Germany--History--20th century.
Princeton subject headings:
Industries--Social aspects--Germany--History--20th century.
Siemens Aktiengesellschaft--History--20th century.
Social responsibility of business--Germany--History--20th century.