"wurtex" Maschinenbau Hofmann G.m.b.h. & Co.
3h Inventors Aps
888804 Ontario Limited
A-Betong Ab
A-Betong Ab/sabema Material Ab
Aaseth Allen
Abate Giorgio
Abercrombie James C.
Abramychev Aleksei Viktorovich
Aco Polymer Products Inc.
Acrow (engineers) Limited
Adams Chris J.
Addtek Research & Development Oy Ab
Advanced Concrete Innovations Inc.
Ahonen Esko M.
Aiken Joseph P.
Akerfors Ingvar
Albert G. Langenkamp
Albert Sabine
Albert W. Iselin