18.87MHZ 18.8MM-15.24MM-25-5590H-05 18.8MM-15.24MM-25-8810 18.8MM-15.24MM-25-8815 18.91.8.230.0040 18.91.8.230.0042 18.937500(X-TAL) 18.9375MHZ 18.9375MHZ +/-10PPM 20PF 18.A1.8.230.0000