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About product and suppliers:
        Alibaba.com offers 340 parallel ruler products. About 80% of these are rulers, 2% are math sets. 

A wide variety of parallel ruler options are available to you, such as triangular ruler, straight ruler. You can also choose from no, yes. As well as from free samples. 

There are 340 parallel ruler suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of parallel ruler respectively. 

Parallel ruler products are most popular in Western Europe, South America, and Eastern Asia. 

You can ensure product safety by selecting from certified suppliers, including 259 with Other, 151 with ISO9001, and 5 with OHSAS18001 certification.
        
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