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      | DEFINITIONS
          & HISTORY: MISSILE AGE |   
	  |  | With the advent of the missile age, and the greater emphasis on miniaturization
          of components, knowledge of the critical effects of airborne contaminants
          on the manufacturing process radically advanced.
 
 The hard won lessons of the Second World War resulted in the first
          modern cleanrooms. The patterns of airflow, air filter efficiency,
          diffusers, exhausts, air temperature, and air movement between work
          areas were all recognized as key factors in the modern manufacturing
          facility.
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