| 摘要 |
Two hemispherical type head halves with integral first bevel gears, are mounted on a carrier shaft for rotation about a first polar axis. The carrier shaft extends perpendicularly to, and is fixed to,an equatorial carrier plate in which independently driven second bevel gears, meshing with the first bevel gears are supported for rotation about a second axis perpendicular to the first axis so that one of the types on the hemispherical type head halves, can be selected for printing by turning the second bevel gears independently of each other by key controlled setting means.
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