Assertion: diver's cylinder | /r/HasProperty | multiple
Facets:
Source sentences:
text: Invented by Greg Flanagan in 1979 for North Florida cave divers, and further developed by William Hogarth Main, the back plate and wing configuration is not a recent development, but has gained popularity because of suitability for technical diving where it is often used, as the technical diver often carries multiple cylinders on his back and/or clipped to D-rings on the harness webbing.
text: Keeping this in mind, it is not hard to see why technical divers who do long deep dives require multiple cylinders or rebreathers, and commercial divers normally use surface-supplied diving equipment, and only carry scuba as an emergency gas supply.