| 21. | A improved cone - shaped model is given in order to improve the old cone - shaped model
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| 22. | Cone - shaped bayonet ring couplings for rolling stock part 11 : intubatton straight couplings
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| 23. | Cone - shaped bayonet ring couplings for rolling stock part 13 : meter - pipe straight couplings
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| 24. | Cone - shaped bayonet ring couplings for rolling stock part 15 : cone thread straight couplings
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| 25. | Deformation observation of the non - survey - marked cone - shaped high object with forward intersection method
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| 26. | Cone - shaped bayonet ring couplings for rolling stock part 17 : columned thread straight couplings
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| 27. | Cone - shaped bayonet ring couplings for rolling stock part 20 : cone thread angle coupling bodies
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| 28. | Cone - shaped bayonet ring couplings for rolling stock part 10 : reducing straight coupling bodies
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| 29. | Cone - shaped bayonet ring couplings for rolling stock part 14 : meter - pipe straight coupling bodies
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| 30. | Cone - shaped bayonet ring couplings for rolling stock part 12 : intubatton straight coupling bodies
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