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| WALL-PATTERN SWITCHBOARD FOR METALLIC CIRCUIT LINES, 6 to 25 LINES
No. 629 shown pictured to the right.
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Last revised: March 26, 2024FM2 |
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| WALL-PATTERN SWITCHBOARD FOR METALLIC CIRCUIT LINES, 6 to 25 LINES
No. 629 shown pictured to the right.
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Last revised: March 26, 2024FM2 |
Fitted with similar parts to No. 622, but with all apparatus arranged for
metallic circuit working, and with high-resistance ring-off indicators in bridge, instead
of low-resistance ones in series.