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Reverse Polish notation
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==== Soviet Union / Semico ==== [[Soviet Union|Soviet]] programmable calculators ([[MK-52]], [[MK-61]], [[Elektronika B3-34|B3-34]] and earlier [[B3-21]]<ref name="Elektronika_B3-21"/> models) used reverse Polish notation for both automatic mode and programming. Modern Russian calculators [[MK-161]]<ref name="Elektronika_MK-161"/> and [[MK-152]],<ref name="Elektronika_MK-61"/> designed and manufactured in [[Novosibirsk]] since 2007 and offered by [[Semico]],<ref name="SEMICO"/> are backwards compatible with them. Their extended architecture is also based on reverse Polish notation.
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