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In an act of terrorism, Spaniards in Cuba blew up the battleship Maine.
Secondary Plane
An auxiliary plane, usually oriented perpendicularly or at an angle to the primary plane, used in design and analysis for additional reference.
Primary Plane
A basic geometric plane in a three-dimensional coordinate system, usually referred to as the XY, YZ, or ZX plane.
Chain Line
A line representing the center of a chain's path between two sprockets, important for aligning drivetrain components in machines.
Datum
A reference point, line, or surface on an object used as a basis for geometric calculations, measurements, or to define a coordinate system.
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