TR-18C4 is equivalent to a Bach 1
TR-16C4 is equivalent to Bach 1.5C
TR-14A4A is equivalent to a Schilke 14A4A
TR-14B4 is equivalent to a Bach 3C
TR-14C4 is equivalent to a Bach 5C
TR-14D4 is equivalent to a Bach 5B
TR-11B4 is equivalent to a Bach 7D
TR-11C4 is equivalent to a Bach 7C