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for at undgå parasitisk støj isoleres blokken fra gravens sider og bund med elastiske blokke med en spærrefrekvens, der højst er halvdelen af maskinens slagfrekvens udtrykt i slag pr. sekund
to avoid any parasitic noise, the block shall be insulated against the bottom and sides of the pit by elastic blocks, the cut-off frequency of which shall not be more than half the striking rate of the appliance tested, expressed as strokes per second