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
Ozalid Corp, ?
front row: John Mornan, Joe Colson.
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