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If by 'leaf factory' you mean the leaves of plants, then the source of free energy is the Sun, in the form of sunlight form the Sun.
in a factory !
Leaf Storm was created in 1954.
Nissan Leaf was created in 2010.
Leaf Rapids was created in 1969.
Bright Leaf was created in 1949.
LEAF Award was created in 2005.
The Leaf-Chronicle was created in 1808.
The Album Leaf was created in 1998.
Sweet Leaf was created in 1971.