Other countries that made slide adders included the UK, France, Czechoslovakia, Japan, Hong Kong and the Soviet Union

Exactus Mini-Add
Exactus, London EC4, UK (made in England)
8 slides, 9 digit display; Sterling currency
Flip over front panel for subtraction
Aluminium & steel
4.5 x 3 inches
With wallet, stylus & instructions
1950s/1960s
Based on the Correntator

Machine à Calculer RéBo
Made in France
9 slides, 9 digit display
Brass & steel
6.3 x 3.5 inches
With wallet and stylus
1920s

RYCHLO POČTAŘ
Made in Czechoslovakia
8 slides, 9 digit display
Aluminium & steel
5.7 x 3.3 inches
With wallet and stylus
1930s
Obtained from the Czech Republic

Kingson Pocket Calculator
Empire made (Hong Kong)
Sterling currency version
6 slides, 6 digit display
Aluminium & steel
6.5 x 1.7 inches
With stylus
1950s/1960s

Kingson Pocket Calculator
Made in Hong Kong
6 slides, 6 digit display
Aluminium & steel
6.5 x 1.7 inches
With stylus & PVC sleeve
Table to convert fractions to decimals
1960s/1970s
Copy of Addiator Arithma

“Calculator”
Made in Japan
6 slides, 7 digit display
Metal & plastic
5.5 x 2.5 inches
1950s/1960s
Also sold as “Magic Brain” and “Taschenrechner”; 7 slide, 8 digit display version also made (see below)

Chadwick Magic Brain Calculator
Made in Japan
7 slides, 8 digit display
Metal & plastic
5.5 x 3.2 inches
1950s/1960s
Obtained from Canada

Winfield Pocket Calculator (sold by Woolworths)
Made in Hong Kong
6 slides, 6 digit display
Aluminium & steel
6.5 x 1.7 inches
With stylus, PVC sleeve, card box and instruction leaflet
Table to convert fractions to decimals
1960s/1970s
Identical to the Kingson except for the name (same manufacturer)
Copy of Addiator Arithma

Omega Pocket Adding Machine
Possibly made in Hong Kong (Construction same as Kingson except for width)
9 slides, 9 digit display
Aluminium & steel
6.5 x 2.3 inches
With stylus,
Table to convert fractions to decimals
Conversion table on rear from Imperial to Metric
Late 1960s
Copyright by T H Ramsey 1964