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 master clocks/signalling master clocks

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Type series 920
on-wall mounting
1, 2 or 4 clock lines,
0, 2 or 4 signal contacts,
with or without power
outage reserve
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Type series 920
19" rack mounting
2 or 4 clock lines,
0, 2 or 4 signal contacts,
with power outage reserve
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