{HEAD ~ These three new types} of {TAIL ~ leveling instruments} do not rely on spirit level bubbles in glass vials used in dumpy levels and in tilting levels, nor on the so called self leveling pendulums used in the automatic levels 
{ HEAD ~ These three new types } of { TAIL ~ leveling instruments } do not rely on spirit level bubbles in glass vials used in dumpy levels and in tilting levels , nor on the so called self leveling pendulums used in the automatic levels
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