URI:
       Index of /communications/hallicrafters/sx-99
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   DIR /communications/hallicrafters
       094-901381-G_Hallicrafters_SX-99_SX-99U_Mark_1B_1C_1D_Operating_And_Service_Instuctions_Jul1957.pdf
       SX-99_Mark_1_PF_Mar1956.pdf