Ozalid Machine Preventive Maintenance Course Number 1 - 1955

 
top row (four people including Fred Ringlet who is really in the third row) (l to r):  ?, John (Jack) Evans, ?, Fred Ringlet.
second (middle) row (four people):  ?, Bob C Pambrun, Course Presenter from Ozalid Corp, ?
front row:  John Mornan, Joe Colson.

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