贝尔浩型片(齿)孔：上下平行两边弯曲的胶片齿孔。
Bell and Howell perforation: a film perforation shaped with flat top and bottom and curved sides.
导出奥利康和克林根贝尔格锥齿轮铣齿机差速挂轮比和分齿挂轮比计算通式；
In this paper calculation formulas of differential change gear raito and index change gear raito for Oerlikon and Klingelnerg bevel gear generating machines are derived.
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