| 21. | In the 18th century involute gears, another mathematical derived design, came into use.
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| 22. | The problem employs the " study of involute cycloidal, epicycloidal and hypocycloidal curves ."
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| 23. | The Nautilidae are involute or slightly evolute and generally smooth with straight to sinuous sutures.
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| 24. | It varies continuously along the involute profile.
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| 25. | "Zetoceras " has a compressed involute shell with a very small umbilicus.
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| 26. | Members of the Phylloceratidae are characterized by smooth, involute shells with very thin walls.
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| 27. | An iron-involuted brooch of the La T�ne II type has also been found.
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| 28. | The shell of " Falcitornoceras " is strongly involute, lacking an umbilicus.
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| 29. | Shells may be either evolute or involute.
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| 30. | The implementation of the involute tooth yielded a standard gear design that provides a constant speed ratio.
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