Columbia subject headings:
Harvard subject headings:
Electrical engineering--Great Britain--History.
Electrical engineers--Great Britain--Diaries.
GEC Research Laboratories--History.
Paterson, Clifford, Sir, 1879-1948--Diaries.
Princeton subject headings:
Electrical engineering--Great Britain--History.
Electrical engineers--Great Britain--Diaries.
GEC Research Laboratories--History.
Paterson, Clifford, Sir, 1879-1948--Diaries.