Signed, in black felt tipped pen, lower right, verso: GN. [underlined] 10-80'
Inscribed, in black felt tipped pen, lower right below the drawing: oxygen pumps Inscribed, lower left: SHELF SECTION | PRE-RESIN SEAMS | [detail drawing of a joint with arrows going from the words "RESIN" and "FLOW"] Inscribed, lower center: FORCED TUBE PUMP | circulation system | WATER - SELF CONTAINED | OXYGEN 3 pumps 3 valves = 9 lines Inscribed, in pencil, upper left, verso: 550