Kraftwerk's "Pocket Calculator" was released throughout 1981 in a bewildering array of different edits & Foreign language versions. Ironically, the original German interpretation has never been widely available outside of their home country, while the lyrics - "Ich bin der musikant mit Taschenrechner in der hand" (literally, "I'm the musician with calculator in hand") - are markedly different to the better known, English alternative. French, Italian & Mexican variations were also completed, though not necessarily issued - the Italian translation, for instance, was created exclusively for use during period television appearances such as this one (Ralk & Wolfgang exchange a sneaky smile at 2:23, you'll notice...).
"Dentaku", is an Oriental rendition that appeared on the flip of the British & Germans 45s, & as a single in it's own right in Japan, of course. Despite it's long term popularity in the U.K., it's sadly never been included as part of any subsequent edition of the Computer World album. The Japanese response to "Dentaku" has always been ecstatic - already voracious Kraftwerk fans in the main, they literally go nuts when Ralf sings in their native tongue.
Minor point of interest: the original German fade is a few seconds longer than any of the other versions, revealing an otherwise unheard &, frankly, slightly clumsy, denouement. Nice to know they might be human after all, hmm?