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A measuring system based on ultrasound was developed to measure body movement. Movements of cash register operators, of microscope operators and of operators using a magnifying glass were measured. The analysis showed different results. On one hand the operator found it rather difficult to use his full length of his arm (maximum working area) to operate the cash register and a smaller working area was proposed. On the other hand a rigid posture of the head and the shoulder was found to be typical for operators working with microscopes and magnifying glasses. This puts a rather high static load upon the muscular system used to stabilise the back and the neck.

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