2002³â	1¿ù		½Å±¤Æ÷Åä·¹ÀÌ ¼³¸³
			µµ½Ã¹Ù X-Ray Tube ³»¼ö ƯÆÇ
2003³â	2¿ù		Murata ³»¼ö ƯÆÇ
	11¿ù		Crystal, Oscillator, VCXO, TCXO Á¦Á¶
			Century Crystal Electronics Çѱ¹ Áö»ç
2004³â	2¿ù		Jiakang Electronics Çѱ¹ ƯÆÇ
2012³â	3¿ù		¢ß½Å±¤Æ÷Åä·¹ÀÌ ¹ýÀÎ Àüȯ
2015³â	10¿ù		VMI, CalRamic Technologies Çѱ¹ ƯÆÇ
2015³â	11¿ù		ȨÆäÀÌÁö °³¼³ (www.skphotora.co.kr)
			¿Â¶óÀθÅÀå °³¼³ (www.skphotoray.com)
2017³â	1¿ù		ȨÆäÀÌÁö ¸®´º¾ó (www.skphotoray.co.kr)