ftpmm meaning in English

调相制和356

1 2 in 2550 ftpmm 64 770 ftpi information technology - magnetic tape and cartridge for information interchange - unrecorded , 128 - track , parallel serpentine , 12 . 65 mm 1 2 in , 2550 ftpmm 64 770 ftpi
信息技术.信息交换用磁带和盒式磁带.无记录128磁道并行螺旋形12 . 65 mm
0 . 495 1944ftpmm 49378ftpi information technology - magnetic tape and cartridge for information interchange - unrecorded , 36 - track , parallel , 12 . 57 mm 0 . 495 in , 1944 ftpmm 49378 ftpi group - coded recording
信息技术.信息互换用磁带和盒式磁带.未记录的36 -磁道平行的12 . 57mm