No. 309A/A
As No. 310A/A, but without bell set. Suitable for use as extension telephone.
No. 309B/A
As No. 309A/A, but with Dial Dummy No. 5 fitted in place of dial.
No. 309A/A
As No. 310A/A, but without bell set. Suitable for use as extension telephone.
No. 309B/A
As No. 309A/A, but with Dial Dummy No. 5 fitted in place of dial.
From SIEMENS BROTHERS & CO. LIMITED catalogue No.500/54
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Last revised: October 23, 2003
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