2023/12/01 update
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Overview – Front Spring AA-5310-B Service-Only
AA-5310-B was an 18-leaf spring assembly with 1-3/4” wide leaves. It was only sold through service starting August 1929 as an upgrade-replacement for the production assembly which was assigned an “A” suffix (i.e. AA-5310 became AA-5310-A).
under construction