Produx ST - Pocket Adding Machine - Produx Germany, 1930. The smallest adder in the Produx series developped by Otto Meuter. Dimensions 57x150x2mm. Weight 64 grammes. The tiny machine is permanently packet in a jacket with a protective cover. The jacket holds a copper stylus with a small hook to move the slide up and down. Pulled-down slides emerge at the bottom of the machine. They must be pushed back in order to zero or reset the adder.
Gem Adding Machine - Automatic Machine Co., New York, USA, 1904. Also called the Golden Gem. Chain adder, seven chains (digits) in this case. Dim: 11 x 7,8 x 2 cm. 390 gr. Heavy and robust. Addition only. The chains are pulled down with a metal stylus which demand some strength while carrying. Carry is automatic. Down to the right we find a turning reset button.
Stephenson Adder - A.M. Stephenson, MFR Joliet, 1899. Dim: 90 x 46 x 3 mm. Tiny adding machine for additions up to 199. Used for adding small numbers in columns. The little machine was sold for less than 2 dollars. So in 1929 a clone appeared on the market: the Vest Pocket Adding Machine manufactured by G.N. Mindling, Pittsburg, PA.
CORRENTATOR Addiator - Jean Bergmann GmbH, Berlin 1920. Antique but smart and handy (for that time) handheld machine for adding and subtraction. CBR stands for Continentale Büro Reform. In the middle of the tiny brass machine a little metal flap can be turned to switch between the two operating modes: add and subtract.
Francia Single Adder - Unis France Elpe, Paris, 1922. Small pocket adding machine for additions only. Copper, weight 140 gram. Dimensions: 15 x 9 cm. It is a usual adder as they were used frequently in those days. From the same manufacturer the Picma: an adder for adding 1/2, 1/4 and 3/4 as well. On top a pull/push lever for zeroing all registers.
The Pocket Adding Machine (PAM) - Unkown British Manufacturer, 1925. A Sterling currency adder used to add amounts of money in British Pounds, Shillings and Pennies. 86 x 126 mm. Similar to the Pro Calculo adding machine. This little machine in housed in an imitation snake skin cover. Material is grey pewter. Digits are display in red and appear in small round windows. On top there is a thin reset lever for zeroing all registers.
Produx Saldo Machine - Meuter & Sohn, Hamburg 1955. Simple slide adder for addition, subtraction, multiplication and division. The colorful handheld machine comes with a stylus for sliding the rules up and down and for transport to tens, hundreds, etc. The machine is devided in two parts: Subtraction above and Addition below. They share the display with the calculating results. The reset handle on top can be pulled and pushed.
ADDIATOR Addiator Gesellschaft Berlin 1932. A mechanical add/subtract pocket calculator. A sturdy design, variants of it were sold from August, 1920 until 1982. It was composed of sheet-metal sliders inside a metal envelope, manipulated by a stylus, with an innovative carry mechanism, doing subtract ten, carry one with a simple stylus movement. Side one is for doing additions; the other side for subtractions.
PRODUX Adding Machine - Produx Co. Germany 1948. Meuter's calculators became successful under the name PRODUX. After worldwar 2 the company split: In West-Germany PRODUX production continued and under the East-German communist system RECORD calculators were produced until 1988. This little pocket-machine (15x8 cm.) is for adding (downward sliding) and subracting (upward sliding) only.
PRODUX Adding Machine - Pro Calculo and Correntator 1935. This thin calculator can only add and subtract. Numbers are entered from the vertical sliders (one set for positive numbers and one for negative numbers) using the accompanying stylus. The results appear in the circular windows in the middle.
RECORD Rechenapparat - Lucy Meuter, Klausdorf, East Germany 1969. Addiator similar but bigger than the Produx Adding Machines (above). These pocket-machines very popular and were sold until 1980 in almost every stationer's shop in East Germany. The production unit was run by Lucy Meuter: ex wife of Otto Meuter: the manufacturer of Produx machines. Lucy died in 1983. Many remaining Record Addiators were sold on eBay.
ADDIMULT Sumax-E - Hans-Wolfgang Kübler, Donaueschingen 1958. Desktop and handheld addiator. Adding is done Ron one side (the Summator) while subtraction from the result can be done on the rear side of the calculator. Dimensions: 13x8.5x.8 cm, 100 g. The machine comes with a stylus for operating the slides. On one end the stylus is a propelling pencil.
ARITHMA Addiator - Universal. Device nr. 56 - Made in West Germany. 'World's Finest Pocket Adding Machine'. Standard Model. Add and divide. There was also a Addiator Universal - Lux with an extra display for negative saldi. The little machine has a slim holder which holds the stylus with which the slots can be moved up and down.
ARITHMA Addiator - Addiator Rechenmaschinenwerke, Berlin 1964. Using the pen-like brass stick to its left side, the user would perform calculations by inserting the tapered end into the slots next to the numbers. The top set of numbers would be used for addition, and the bottom for subtraction, with the total displayed in the center frame.
ADDIATOR Castell Combi-Addiator Rechenmaschinenwerke, Berlin 1964. Much like the Arithma Addiator above but with a small sliderule on the backside. With two kinds of portable calculators in one it was possible to do complex calculations. The Castell was favoured by engineers and architects.
WIZARD Slide Adder - Wizard Werke GmbH Bonn 1946. Handheld addiator for adding, subtracting and multiplying. A rather simple machine not suitable for scientific and engineering purposes. The counting mechanism is not very precise. To the right: the pin to operate the machine.
ADDIATOR - Slide Adder - Manufacturer unknown. Two identical addiators 6,5 x 14 cm. Like the Wizard these handheld machines are operated by moving digits up or down and to transport up or down. Reset by pulling out tand pushing back the handle on the top. The difference is that the one to the left is made of bakelite; the right one of red plastic.
