MTR6618-I/PT` MTR6618-I/PT= MTR6618T-I/PT MTR-680R-SR3-J-NA-G-0-T MTR680R-SR3JNAG0T MTR6853-I/pt MTR6-L12G1-B04-US MTR7208-I/PT MTR7519(1947) MTR7519-I/PT