The outputs of the first electrically-driven actuator (1) and the second electrically-driven actuator (2) are combined by a trapezoidal link (3).

The outputs of the first electrically-driven actuator (1) and the second electrically-driven actuator (2) are combined by a trapezoidal link (3).

The spacer pieces (14b) have a generally trapezoidal cross section, complementary to a trapezoidal cross section of the pre-wound coils (17).

The keystone-correction unit is configured to correct keystone distortion in the document image.

The trapezoidal correction unit (14) performs trapezoidal correction based on the supplied coefficient set.

The set screw is provided with a centrally positioned set point and a V-ring for cutting engagement with the surface of a clamped rod.

The said tenons and tenon holes could be quadric, trapezoid, circular, oval and trapezoid with arcs.

The set screw V-ring is positioned and adapted to deform into engagement with the closure plug by engagement with the rod surface.

Prongs may have trapezoidal shape.

The second orifice has a substantially trapezoidal shape.

The preferred configuration of the chamber is trapezoidal.

The central tip holder (12) is trapezium-shaped having a connecting portion (18) and a head portion (20) formed integral therewith.

The peripheral shape may be rectilinear or trapezoidal.

The post can be a tapered post or the post can be a non-tapered post.

The pattern has an overall shape that is triangular or trapezoidal.