Braun 4955, ET23

Serial Number	None (1), labelled "4955"
Accessories	None
Condition	Good. Some wear from normal usage, no ugly defects
Comment	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!
Comment	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!
Comment	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 "Ausschließlich 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
Links
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).