ECG / EKG Medical Grade Recording Chart Paper, Roll, Black Grid, 50x30, Equivalent to Philips - HP 9270-0980, 40451, 40457, Kendall 20060622, 8422421. Fits Hewlett Packard models 1504, 43100A, 43110A/M/MC, 43120A, 43200A, 78173A/W, 78179A/W, 78663A with original recording, 78663A, 78635A, 78660A/B, 78661A/B, 78670A/B, 78671A/B, M1722A/B, M1723A/B and M1729A/B (sold by the roll, 50 rolls per case) Availability: Usually ships the same business day Philips - HP 9270-0980, 40451, 40457 equivalent A18545$0.94 Copyright 2006-2011, A1cardiology.com