Sughrue, Mion, Zinn, Macpeak & Seas
Magnetic tape cassette having improved guide pole structure
 A magnetic tape cassette having a guide pole which is in sliding contact with the magnetic surface of the tape produced in such a manner as to improve the running characteristics of the tape while being capable of being manufactured at a low cost. A cylindrical stainless steel base member is subjected to a barreling treatment so as to secure fine particles of an inorganic material having a Moh's hardness of greater than 9 to the slide surface of the guide post. Moreover, the surface of the guide pole can be finished by a surface rolling to reduce the number of scratch-like grooves in the slide surface having a depth of more than 0.2 .mu.m and a width of less than 40 .mu.m to less than 11 per millimeter in the sliding direction of the tape. 
Fuji Photo Film Co., Ltd.
G G G
G11B G11B G11B
inventional inventional inventional
Takuzi Minoru Takahito Tsutomu Yasutoshi
Yamada Kanazawa Miyoshi Sugisaki Okuzawa