I was just looking through CAM magazine Vol. 2, No. 8, 1945, and saw something on track lubrication. It reminded me of this thread, so I thought I would add that literature to the discussion.
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1953 M37 CDN
1953 M38A1 CDN W/WN
1967 M38A1 CDN2 W/WN
1968 M38A1 CDN2 W/WN
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