The build up of calcium deposits in a micrometer. It may happen as a result of dust from blackboard chalk settling in the screw mechanism of the micrometer.
The build up of calcium deposits in a micrometer. It may happen as a result of dust from blackboard chalk settling in the screw mechanism of the micrometer.
The build up of calcium deposits in a micrometer. It may happen as a result of dust from blackboard chalk settling in the screw mechanism of the micrometer.
The build up of calcium deposits in a micrometer. It may happen as a result of dust from blackboard chalk settling in the screw mechanism of the micrometer.
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The build up of calcium deposits in a micrometer. It may happen as a result of dust from blackboard chalk settling in the screw mechanism of the micrometer.