Braun 4955, ET23

Serial Number None (1), labelled "4955"
Accessories None
Condition Good. Some wear from normal usage, no ugly defects
Inside on the circuit board there is a label "ETR22-340402B".
On the back "4955".
Acquired 26.9.2002


Serial Number None (2), labelled "4955"
Accessories Pouch

Braun control ET22, Anleitung zum Gebrauch mit praktischen Beispielen (German), dated 1976
Condition Mint!
Inside on the circuit board there is a label "ETR22-340402B".
On the back "4955".
Acquired 1.12.2002

Serial Number Y0123480K, inside battery compartment, labelled "4955 710"
Accessories DC 220V power supply
Condition Very good!
Differences as compared to the above units:
  • Label on the back shows "Typ: 4 955 710"
  • The battery lid is secured with a screw
  • The battery lid says "Ausschlie▀lich aufladbare Batterien (Ni-Cd) verwenden." (Use only rechargeable Ni-Cd batteries)
  • On the front it has "ET 23" printed above the display.
Acquired 27.2.2004
Type, Precision, Input Mode Simple, 8 BCD digits, no exponent, Algebraic
Programmable No
Memory 1 memory, not permanent
Display 9 digit 7-segment green LED
Special features Summation register, instructions on the back of the calculator
Original Pricing, Production Introduced 1977, DM 98.50 (approx. 48 Euro), Germany/Frankfurt M.
Batteries 2x AA or external power supply (3V)
Dimensions Length 14.5cm, Width 7.8cm, Height 2.4cm
Comment Also 4955-700 and 4955-710. After the 4950 (ET22) this was the 2nd Dietrich Lubs/ Dieter Rams construction. The first Braun model, type 4954 (ET11) is not a Lubs/Rams construction but was made by Omron. (Information thanks to Peter Muckermann and Shinichiro Osaki).
There's various contradicting information about the ET22/ET23 and 4950/4955 (700/710) type units and how they can be recognized. So I'm not really sure what I've got here.
It seems that there are versions 4950/ET22, 4955-700/ET22, a 4955/ET23 (see above) and a  4955-710/ET23 (see above).
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