Type OB 400
Wall Pattern Switchboards
Metallic Circuit
Local Battery System
 OB 400/12 shown
pictured to the right.
FRAMEWORK
Polished walnut, with the jack field covered with fibre.
EQUIPMENT
1 x JACK for each line.
1 x OPERATOR'S CORD AND PLUG.
1 x PAIR OF CORDS with 2-point plugs ee table for number of cord circuits for each board).
1 x SPEAKING AND RINGING KEY for each cord circuit.
1 x CALLING INDICATOR for each line.
1 x CLEARING INDICATOR for each cord circuit.
1 x NIGHT BELL.
NIGHT BELL SWITCH.
GENERATOR. RH 5120, 5-magnet.
MICROTELEPHONE. RE 5052, with Cord RS 7021.
TESTING KEY.
| TYPE |
OLD TYPE No. |
No. of metallic ccts |
No. of cord ccts |
Height ins |
Width ins |
Depth ins |
Weight in lbs. |
| OB 400/6 |
627 |
6 |
2 |
30.50 |
10.23 |
9.64 |
30.87 |
| OB 400/9 |
628 |
9 |
3 |
33.86 |
10.23 |
9.64 |
33.00 |
| OB 400/12 |
629 |
12 |
4 |
33.86 |
10.23 |
9.64 |
38.58 |
| OB 400/16 |
630 |
16 |
4 |
36.69 |
10.23 |
9.64 |
41.89 |
| OB 400/20 |
631 |
20 |
5 |
37.20 |
12.00 |
9.64 |
48.51 |
| OB 400/25 |
632 |
25 |
5 |
40.56 |
12.00 |
9.64 |
52.92 |
| OB 400/30 |
- |
30 |
6 |
40.56 |
9.64 |
9.64 |
57.33 |
Taken from the Ericsson Telephone Catalogue 1914
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