128838
Late in the seventeenth century , etching became used to produce the graduations on measuring instruments ; the thinness of lines that etching could produce allowed for the production of more precise and accurate instruments than were possible before .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None