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On many torpedo levels and other specialized levels, there is an angled tube vial
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for all... [DOC] [TLE] How to Use a Torpedo Level | eBay [PAR] The torpedo level is a type of spirit level with three spirit tubes for measuring ... 
These levels are very useful to have for carpentry, plumbing, and other types of ... 
the air bubble trapped inside the tube is used to measure the level nature of a 
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to... [DOC] [TLE] Your Guide to Buying Levels | eBay [PAR] A level is an essential tool used by both building professionals and amateur "do-it
-yourselfers". ... types of vial levels, such as carpenter's levels, line levels, and 
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... to begin projects right away without having to first measure out the right angles. [DOC] [TLE] How to Use a Torpedo Level | eBay [PAR] The torpedo level is a type of spirit level with three spirit tubes for measuring ... 
These levels are very useful to have for carpentry, plumbing, and other types of 
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tool of claim 19 , wherein the level indicator is a replaceable bubble vial. ... A 
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other ... The resulting air bubble is used as an indicator of the orientation of the ... 
The two most common types of instruments for measuring the horizontal ... 
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Types of Levels ... Circular or bull's eye levels use a disc shaped vial with a

Question: The carpenter & torpedo types of this measuring tool use bubbles as indicators
Answer: Level