PERSON@1 's chain MISC@1 surveyors sometimes used a longer chain of NUMBER@1 feet -LRB- NUMBER@2 m -RRB- , known as the engineer 's chain or PERSON@1 's chain .

PERSON@1 's chain MISC@2 sometimes used a longer chain of NUMBER@1 feet -LRB- NUMBER@2 m -RRB- . This is called the engineer 's chain or PERSON@1 's chain .
