Declension of the word "altkupfer"

Singular and plural for Altkupfer, n, strong declension

Singular
Plural
Singular
Nominativ (Wer? Was?)
das Altkupfer
Genitiv (Wessen?)
des Altkupferes / Altkupfers
Dativ (Wem?)
dem Altkupfer / Altkupfere
Akkusativ (Wen? Was?)
das Altkupfer
Plural
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