Original Pratt & Whitney caption:
"Fuel Cell Powerplants being developed for the Apollo lunar mission are
shown in various stages of assembly at one of Pratt & Whitney Aircraft's East Hartford,
Connecticut facilities. These fuel cell powerplants will provide on-board electricity for the
Apollo command and service modules. Their by-product is drinkable water which will be
used by the astronauts. Pratt & Whitney Aircraft is developing another fuel cell system
for the lunar excursion module."
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