Simple categories matching parallel:

• device,
• peripheral,
• surface,
• connection,
• item,
• face,
• support,
• path,
• machine,
• plate,
• line,
• artifact,
• facility,
• structure,

Members with property parallel:

• floppy-disk_drive,
• door,
• gage_block,
• printer,
• runway_light,
• glass,
• dike_boundary,
• floor,
• sheet_material,
• railroad,
• ceiling,
• ceiling_joist,
• cell_windows,
• glasses,
• railway_track,
• polygonal_prism,
• glass_plate,
• edge,
• conical_face,
• network_adapter,
• scanner,
• pipeline,
• backup_arm,
• fingerprint,
• concrete,
• parallel_printer,
• bicycle,
• lcd_electrode,
• end_standard,
• freeway,
• brick,
• railway,
• wall,
• opposing_wall,
• tile,
• leg,
• board_room,
• glass_windows,
• striation,
• step_gage,
• mesh,
• base_line,
• parallel_drive,
• main,
• side_wall,
• optical_plate,
• roof_line,
• windows,
• gps_receiver,
• drywall,
• row,
• opposite_wall,
• gage,
• horizon,
• optical_windows,
• side,
• digital_camera,
• connection_machine,