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Two companies frequently merged into one and the mark was used for the new company so it is dated back to the oldest company with a direct relationship to the mark.
For example, the mythical company of "Ralph Ltd." was founded in 1820.
Following the loss of the Rosenthal-owned original ⇒Krister Porzellan-Manufaktur A. factory in Waldenburg (Silesia) after World War II the group had built a replacement factory in Landstuhl (Rhineland-Palatinate) during 1952/53.
This factory was by now not working efficiently any more, and as the location in Marktredwitz had a better infrastructure it was decided to move the factory to Marktredwitz in 1965.
Official records regarding the number of workers employed show a number of 400 for the year 1913, a number that greatly increased until 1930 (1,000 workers) but dropped down again before 1937 as only 750 workers were registered in that year.
Between 19 production of Thomas items was transferred to a new site named group found another use for it.
If the new firm took the name "Great Pottery, Inc.," it would then be listed as dating from 1820. Journal of the Experimental Analysis of Behavior 21,485-489. (1975) Specious reward: A behavioral theory of impulsiveness and impulsive control. If "Terry and Son" had bought "Ralph Ltd.," the new company would be dated from 1840.The information was often sketchy and sometimes conflicting.
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I have added to these lists many other pieces which are illustrated in a variety of books and catalogues (listed below) as well as figures illustrated on this web site.