1896, but the manor remained in the Grill family until 1980. It became a listed building in 1977. Jean Abraham collected all of his letters, accounts and notes in an archive at Godegård, now known as the Godegård Archive. , the archive, containing over 7,000 documents, is in the Nordic Museum. It has been digitized and is available online as a result of a request from the Macau Historical Archives in 2003. Mariedamm The Trehörnings blast furnace in Mariedamm was originally built by local miners in 1636. Louis De Geer bought it in 1648, and it became part of the Godegårds ironworks which was sold on to Jean Abraham in 1775. The blast furnace remained a part of the Grill's estate at Godegård until 1888 when it was sold to the Skyllbergs bruk. The blast furnace was in operation until 1889. Since 1923, it is in being cared for and renovated by the Lerbäck Heritage society. At the beginning of the 19th century, a mansion was built in Mariedamm by the Grill family. The mansion was demolished in the 1920s, only one of the wings remain. Garphyttan The mining at Garphyttan was started during the Middle Ages by German miners. These were called "garps", a medieval Swedish word meaning "loudmouths" or "braggers". The main product was lead ore which also contained silver, but the yield from the ore was small and business faltered a number of times during the 17th century . It was not until the factory was bought by three Dutch merchants in 1661, that the company started to flourish again. A trip hammer, two hearths, a smithy, a sawmill, a silver refinery and housing for the workers were added. The factories and the ironworks went through several owners until 1773 when Abraham (III) acquired them all. The previous owner, Michael Grubb, had borrowed money from the Anthony Grill & Sons Trading House in Amsterdam, and when he failed to repay the loan in 1774, the factories became the property of the Grills. The building of a manor at Garphyttan started during the 17th century, and several additions were made in the middle of the 18th century. The main building of the manor was destroyed during a fire in 1830, only the four wings remain. Stora Nyckelviken Stora Nyckelviken manor was completed in 1746 by Herman Petersen, a wealthy merchant and director of the SOIC. The manor was