Chemical fiber threads and yarns not for textile use; synthetic fibers, namely, plastic fibers, not for textile use; polyimide chemical fiber threads and yarns not for textile use; sheet-like chemical fiber materials, namely, threads and yarn, not for textile use; sheet-like synthetic fiber materials, namely, threads and yarns, not for textile use; sheet-like polyimide fiber materials, namely, plastic fibers, not for textile use; chemical fiber yarns and threads not for textile use; synthetic...