Original patented mechanical seal type still in service after 40 years
World pumps ; 445
2003
Aufsatz (Zeitschrift)
Englisch
Kraftfahrwesen | 1980
|Engineering Index Backfile | 1933
Still flying after all these years . Junkers Ju-52 still going strong after 60 years
Online Contents | 1996
Cosmonautics: Astronaut still after 36 years
Online Contents | 1999
Comment - Still tinkering after 20 years
Online Contents | 2013