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Methods of securing the backstays:
1. Shifting backstay, before I8th century;
2.,3. Shifting backstays, mid I8th century;
4. Shifting backstay, I8th/I9th century;
5., 6. Standing backstays, I9th century;
7. Standing backstay, I8th/I9th century;
8. Standing backstay, I9th century
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