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Signature	Maker	Instruments	Comments	Location	References
PORENSON, ALBERT	Germany, 1774, MIM		rebuilt a large astronomical quadrant in 1744; the quadrant is now in the Schloss Gottorf, Schleswig, Germany.		Schlee; RSW.
PORENSON, ALBERT	Germany, 1774, MIM		rebuilt a large astronomical quadrant in 1744; the quadrant is now in the Schloss Gottorf, Schleswig, Germany.		Schlee; RSW.

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