Clock Chart Drive 725 Spring Wound - 11-Jewelled Escapement Interchangeable With CDS 820 Battery Chart Drive A Standard In Most Circular Recorders				CDS 820 Battery Chart Drives 1.5V Alkaline or 3.6V Lithium "C" Battery UL and cUL Listed For Hazardous Locations Temperature Range: -40°F to 160°F Interchangeable With Clock Chart Drives 725
830 Fast/Slow Battery Chart Drive The only Clock of it's kind 90° Test Pattern on each Chart 5 Regular Speeds				Chart Hubs For Clock Chart and Battery Drives