OCR'd Text:
SCHOOL HYGIENE : SAFETY LB 3209 PRECAUTIONS Educational establishments: unattended operation of experimental apparatus outside normal working hours, by the Education Service Aavisory Committee. HSC, 1986.
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SCHOOL HYGIENE : SAFETY LB 3209 PRECAUTIONS Educational establishments: unattended operation of experimental apparatus outside normal working hours, by the Education Service Aavisory Committee. HSC, 1986.
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