on Dec 31, 2015
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Known Information
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  The first crossbow fibulae, from the early 3rd century AD, has short,  thin arms, no knobs, a long bow and a short foot  Type II, dating to the 4th century, has larger knobs and a foot  that is approximately the same length as the bow  Type III, also dating  to the 4th century, has a foot that is longer than the bow
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