. "102814432"@en-us . "0"^^ . . "103512452"^^ . "03512452-n"^^ . . . "an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on"@en-us . . . . . "103384013"@en-us . "heliograph"@en-us . . . . . "heliograph"^^ . "0"^^ . .