Nos. MB 300 and MB 310
MB 300 consists of a Micro-telephone RE 9100, telescopic type, with Waterproof Cord RS 7010, 2 Magnet Generator, Magneto Bell, with 500 ohms, resistance, Dry Cell, press-button for short circuiting the Bell, and 2 Terminals for the line.
This instrument is protected by a leather case, with shoulder straps.
Weight (with Cell) 9lbs.
MB 310 is similar to the above, but is fitted with 5 Bar Generator and 2000 ohm. Bell.
Weight (with Cell) 13lbs.
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