| 21. | The only major design difference between the 57 and 75 that would emerge was the recoil system.
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| 22. | Tom's invention is similar to the recoil system used in the French 75mm field gun.
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| 23. | The Type 4 is the first Japanese weapon to replace the hydrospring recoil system with the hydropneumatic.
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| 24. | Furthermore, it used the a variable recoil system that shortened the recoil as the elevation increased.
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| 25. | The usual recoil system in modern quick-firing guns is the hydro-pneumatic recoil system.
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| 26. | The usual recoil system in modern quick-firing guns is the hydro-pneumatic recoil system.
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| 27. | Gun models included both older fixed carriage guns and more modern weapons with counter-recoil systems.
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| 28. | The American version, the M256, uses a coil spring recoil system instead of a hydraulic system.
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| 29. | Firing the guns tended to jam the turret until modifications were made to the guns'recoil system.
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| 30. | Distinctive features of the D-30 include its low mobile mounting and above-barrel recoil system.
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