▁st ove ▁called ▁the ▁A GA ▁cook er ▁was ▁invent ed ▁in ▁ 1 9 2 2 ▁by ▁Swedish ▁Nobel ▁prize ▁winner ▁Gust af ▁Dal én . ▁As ▁a ▁heat ▁storage ▁st ove , ▁it ▁worked ▁on ▁the ▁principle ▁that ▁a ▁heavy ▁frame ▁made ▁from ▁cast ▁iron ▁components ▁can ▁abs orb ▁heat ▁from ▁a ▁relatively ▁low - int ens ity ▁but ▁continu ously - burn ing ▁source , ▁and ▁the ▁accum ulated ▁heat ▁can ▁then ▁be ▁used ▁when ▁needed ▁for ▁cook ing . ▁ ▁Dal én ▁took ▁his ▁design ▁to ▁Britain ▁in ▁ 1 9 2 9 , ▁where ▁it ▁was ▁first ▁manufact ured ▁under ▁lic ence ▁in ▁the ▁early ▁ 1 9 3 0 s . ▁ ▁The ▁cast ▁iron ▁components ▁were ▁first ▁cast ▁at ▁the ▁Co al bro ok dale ▁found ry ▁in ▁the ▁ 1 9 4 0 s , ▁where ▁they ▁are ▁still ▁made ▁today ▁by ▁the ▁A ga ▁Rang em aster ▁Group . ▁Its ▁popular ity ▁in ▁certain ▁parts ▁of ▁English ▁society ▁( own ers ▁of ▁medium ▁to ▁large ▁country ▁houses ) ▁led ▁to ▁the ▁co ining ▁of ▁the ▁term ▁" AG A ▁S aga " ▁in ▁the ▁ 1 9 9 0 s , ▁referring ▁to ▁a ▁genre ▁of ▁fiction ▁set ▁amongst ▁s tere ot yp ical ▁upper - middle - class ▁society . ▁ ▁Mic row ave ▁o vens ▁were ▁developed ▁in ▁the ▁ 1 9 4 0 s , ▁and ▁use ▁mic row ave ▁radiation ▁to ▁directly ▁heat ▁the ▁water ▁held ▁inside ▁food . ▁