Philips PM 6667 Manuel D'instructions page 6

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6. Safety regulations
(in accordance with IEC 348)
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NOTE
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7.1. Line connection
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7.2. Grounding
7.5. External Battery Jack
The two pins connector (p/o BU 107) is diode-protected to
prevent damage if the input polarity is shifted .
7.4. Internal battery unit M 9601
7.3. Internal and external standard