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det må sikres, at der ved fastholdelse af t-stykket og den rokkende bevægelse af 3-d h-maskinen ikke utilsigtet påføres nogen udvendig lodret eller frem- og tilbagerettet belastning.
care shall be exercised in holding the t-bar and rocking the 3-d h machine to ensure that no inadvertent exterior loads are applied in a vertical or fore and aft direction.