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MF press button, table telephone.
Field trial item - similar looking to Telephone No. 726. The pictures show the internal arrangements. The rear view shows the inductor coils used for signalling purposes.
Used in Langham Exchange field trial.
Additional information
| Model | Mark | Grey | Introduced | Remarks |
| Tele 728F | Mk 1 | y | ||
| Tele 1/728F | Mk 1 | y | Bell loudness control fitted |
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FM