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BK7 offers maximum transparency with minimal bubbles or inclusions present as compared to other glasses Current study, therefore, is an

bk77 slot Knurled knobs with coin slot Standard material Polyamide Thread Steel zinc plated moulded Special thread inserts upon request Standard color Black  N-BK7 is a Schott designation for the most common Borosilicate Crown glass used for a wide variety of visible applications  N-BK7 is a Schott designation for the most common Borosilicate Crown glass used for a wide variety of visible applications

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