TCO-743HC737.056MHZ TCO-744SHC8.192MHZ TCO-745JTC50.000MHZ TCO-745VC TCO-745VC(6.176MHZ) TCO-745VC-12.288MHz TCO-745VC32.768MHZ TCO-754B7-20.000000MHZ TCO-754QW-49.15200MHz TCO-756B-60.000000MHZ