Rare on the Web (3)

This old calculators - probably rare, probably not - are unknow on the Web. Any information you have about similar models, shipping date or factory will be appreciated (please use the mail form).

Kessel P408. This basic LED calculator has double multi-color case and keys. This calculator has constant/floating switch and the double zero key (rare in pocket calculators).

Weight/dimensions: 116 gm (7.5 x 13 x 3 cm)

Circuits: TMS0128NC, 2x 75492N, 1 trans (chip date code is first half 1974)

Power supply: 5x AA, ext jack 2,5mm (+ centre)

Tel, Elektron Mark 1. This black calculator show 8+1 single digits fluorescent bulbs and a functional design. Tel is the company brand of Tokyo Electron (Tokyo Electron Limited, www.tel.com) a 40 years old company actually focussed in the the semiconductor manufacturing plant business and electronic distribution.

Weight/dimensions: 205 gm (8.5 x 15 x 3 cm)

Circuits: 15332PC Rockwell (chip date-code: first half 1973)

Power supply: 4x AA battery or ni-cd, ext 6V plug (- centre)

IME, minIME3. Built in Singapore probably by Texas Instruments factory, this pocket calculator was named by the famous '60 electronic calculator pioneer Industria Macchine Elettroniche IME (from Pomezia, Roma). This simple calculator is built few year before IME went out of business.

Weight/dimensions: 146 gm (8 x 14.5 x 3 cm)

Circuits: TMS0851NC, 2 trans (chip date-code: first half 1975)

Power supply: 4x AA, ext 6V plug

IME, mod.400. This desktop calculator with 10 digit gas discharge flat display is built by the italian Industria Macchine Elettroniche (from Pomezia, Roma). With 'made in Italy' label in the back, i think this calculator was built in Japan by OEM factory. It looks like the Busicom 100DA models.

Weight/dimensions: 1090 gm (18.8 x 24 x 7 cm)

Circuits: TMS0106, 32 trans (chip date-code: first half 1972)

Power supply: 220V

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