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MIL-L-221 Revision C, May 21, 1957
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Includes all amendments and changes through Cancellation Notice 1, November 15, 1985
Additional Comments: CNCL NO S/S * BEST COPY AVAILABLE
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This specification covers flexible embarkation and debarkation ladders.

Jacob's ladders shall be of the following types, as specified (see 6.1).
    Type I   — Single chain, with steel
                 rungs and spacer disks.

    Type III — Multiple chain, with wood
                rungs and spacers.