Columbia subject headings:
Machinery--History--Congresses.
Machinery--Philosophy--Congresses.
Mechanism (Philosophy)--Congresses.
Harvard subject headings:
Machinery--History--Congresses.
Machinery--Philosophy--Congresses.
Mechanism (Philosophy)--Congresses.
Princeton subject headings:
Machinery--History--Congresses.
Machinery--Philosophy--Congresses.
Mechanism (Philosophy)--Congresses.