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The first company pens were sold in shopping malls under the brand [[Arumia]], and were presented in various versions  (''Real'', ''Liga'', ''Supra'' e ''Spezial''). The company obtained a good success selling over 20,000 units in the first year. In [[1927]] the company introduced some new models, particularly noteworthy was the [[Arumia|Arumia Original]], a [[button filler]], also made in [[celluloid]], very similar to the [[Duofold]], which was guaranteed for 5 years. In the same year was also created a new line of [[safety]] fountain pens, the [[Colleg]] in the economy segment addressed to students that also was a great success, multiplying by six times the production since the beginning of the [[1926]].

The first company pens were sold in shopping malls under the brand [[Arumia]], and were presented in various versions  (''Real'', ''Liga'', ''Supra'' e ''Spezial''). The company obtained a good success selling over 20,000 units in the first year. In [[1927]] the company introduced some new models, particularly noteworthy was the [[Arumia|Arumia Original]], a [[button filler]], also made in [[celluloid]], very similar to the [[Duofold]], which was guaranteed for 5 years. In the same year was also created a new line of [[safety]] fountain pens, the [[Colleg]] in the economy segment addressed to students that also was a great success, multiplying by six times the production since the beginning of the [[1926]].

Nel [[1928]] vennero risolte le controversie con la [[Parker]] per l'uso del caricamento a [[pulsante di fondo]], e vennero introdotti quattro nuovi modelli in celluloide della serie ''U'' della [[Arumia|Arumia Original]], dove, in mancanza di un marchio migliore, era stata usata la lettera probabilmente stava ad indicare la iniziale di ''unbreakable''. Venne introdotta anche una nuova linea, la [[Meisterklasse|Arumia Meisterklasse]] più costosa. Di nuovo i modelli riscossero un buon successo ed alla fine dell'anno gli impianti funzionavano a pieno regime e riuscendo a malapena a soddisfare le richieste.

In [[1928]] were resolved disputes with [[Parker]] for the use of [[button filler]], and were introduced four new celluloid models in for the [[Arumia|Arumia Original]] ''U'' series, where had been used a letter in the absence of a better brand, probably to indicate the initial for ''unbreakable''. Was also introduced a new line, the [[Meisterklasse|Arumia Meisterklasse]], more expensive. New models met with great success and at the end of the year the plants were operating at full capacity, and barely able to meet the demands.

Nel [[1929]] la ''KWG''' era alla ricerca di un marchio che sostituisse il poco attraente [[Arumia]], ed iniziarono i contatti con Max Sauter, il liquidatore della [[Kaweco]]. Dopo mesi di negoziati il 31 settembre del 1929, la ''KWG'' acquistò il marchio e cambiò nome in ''Kaweco Badische Füllhalterfabrik, Woringen & Grube''.

Nel [[1929]] la ''KWG''' era alla ricerca di un marchio che sostituisse il poco attraente [[Arumia]], ed iniziarono i contatti con Max Sauter, il liquidatore della [[Kaweco]]. Dopo mesi di negoziati il 31 settembre del 1929, la ''KWG'' acquistò il marchio e cambiò nome in ''Kaweco Badische Füllhalterfabrik, Woringen & Grube''.