Radio Frequency transformer, adjustable. Frequency rating: 15.75 MHz min and 33.75 MHz max. Inductance Rating: 400.00 MicroHenries. We don’t have a clue what device these were made for. Military NSN: 5950-00-671-6822. Marking on the device: "CL264TMC82979" Unused in original military package dated 8/89. Only have a few.