The Brother 202 is a handheld calculator from 1975 that demonstrates high build quality and thoughtful design. With dimensions of 88mm x 153mm x 33mm and a weight of 184g without batteries, it has a sturdy two-piece white plastic case with rounded edges. The neutral gray display filter provides good …
The Brother 201 is a mid-1970s handheld calculator measuring 88mm x 153mm x 33mm and weighing 184g without batteries. It has a sturdy two-piece white plastic case with a flat bottom and rounded top. The keyboard has a brushed aluminum surround matching the display panels, one printed with the model …
The Brinlock 33 is a handheld calculator from around 1977. It measures approximately 70mm x 136mm x 23mm (width, height, depth) and weighs 98g without batteries. The case is made from black plastic with a ridged top section that holds a 9V battery. There is also a socket on the …
The Bowmar MX55 is a handheld calculator from 1974. It measures 3.1 inches wide, 5.9 inches high, and 1.4 inches deep. The MX55 weighs 126 grams without the battery. It is powered by internal rechargeable batteries that provide about 5 hours of use per charge. A two-pin AC adapter can …
The Bowmar Math Mate II is a handheld calculator from 1975. It measures approximately 71mm x 135mm x 25mm and weighs about 100g without the battery. The Math Mate II is powered by a single 9V battery or can use an AC adapter. The calculator’s case is made of white …
The Boots 425 Scientific was a rebranded version of the Casio FX-31 released in 1981. This scientific calculator measured 85mm x 145mm x 22mm and weighed 134g without batteries. It was powered by two AA batteries or could be used with a 3V DC adapter. The Boots 425 had a …
The Boots 224 Memory is a slim, handheld calculator from 1978. Made in Japan for the Boots brand, it was actually manufactured by Casio. This becomes obvious when looking at the design, which resembles Casio’s own Memory B-1 model. The 224 Memory measures about 77mm wide, 136mm tall, and 20mm …
The Bohn Omnitrex was an early compact calculator released in 1973 by the Bohn Rex Rotary company. It retailed for $100, which was quite expensive at the time. The Omnitrex measures 68mm x 127mm x 17-22mm and weighs 272g without batteries. It is powered by five AA batteries or can …
The Binatone is a basic handheld calculator from 1975. This one is model # 02-4252. It measures approximately 80mm x 145mm x 28mm and weighs 154g without batteries. The calculator is powered by 4 AA batteries or can use an AC adapter connected through a socket on the top side. …
The Atlas R100 is a handheld calculator from the late 1970s. Manufactured by the German company MBO, it has a sleek, wedge-shaped case made of dark brown plastic. The front is dominated by a metal surround wrapping around the edges, with an oversized green plastic display filter slightly protruding over …
