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Priority to JP16136788UpriorityCriticalpatent/JPH0641129Y2/ja
Publication of JPH0281413UpublicationCriticalpatent/JPH0281413U/ja
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Struttura composta da una bussola fissata ad una riga con attorno un anello o corona graduata, in modo che, posizionata l'indicazione magnetica con una misura, si potranno con l'uso della riga segnare linee con le inclinazioni angolari volute.