141. What is the primary function of the devices shown in the illustration

The transit washers transmit the rotary motion of the cap screw to the actuating assembly.
The grounding straps help prevent electrolysis by improving the conductivity between the components.
The locking plates are used to prevent the fastening devices from vibrating loose.
These abrasion resistors prevent damage to the surface around the bolt holes when tightening the bolts.

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