Air Supply713

7-4.1 Duration of Air Supply 7-14

7-4.2 Compressed Air from Commercial Sources 7-16

7-4.3 Methods for Charging Scuba Cylinders 7-17

7-4.4 Operating Procedures for Charging Scuba Tanks 7-18

7-4.4.1 Topping off the Scuba Cylinder 7-19

7-4.5 Safety Precautions for Charging and Handling Cylinders 7-20

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