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This web site pmnet.cn has the following in the homepage, "万喜 天津 紧固件有限公司机车专用自锁垫圈 机车专用锁紧螺母 机车专用螺栓 动车组专用螺栓 动车组专用自锁垫圈 轨道客车专用鞍型弹簧垫片 316内六角螺栓 薄头矮头内六角螺栓 A4-80外六角螺栓." We noticed that the webpage also stated " 万喜 天津 紧固件有限公司食品加工设备用沉头螺钉 食品包装设备用盘头螺钉 沉头内六角螺钉 医疗器械用沉头螺钉 医疗器械用开槽沉头螺钉." It also said " 万喜 天津 紧固件有限公司船用不锈钢紧固件 船用不锈钢标准件 船用316螺栓 A4-80耐腐螺栓 A4-80六角螺栓 A4-80内六角螺栓 外六角螺栓 船用316螺母 A4-80六角螺母 316不锈钢垫圈 船用双叠自锁垫圈 船用不锈钢卸扣 船用不锈钢索具. 镇江财华密封件有限公司 船用密封件 船用密封制品 船用密封垫片 船用法兰垫片 船用非石棉密封垫片 阀 门填料 高密度聚乙烯管材." The header had 石油物资 as the highest ranking optimized keyword. It is followed by 石油机械, 石油设备, and 石油装备 which isn't as ranked as highly as 石油物资. The next words pmnet.cn used was 海洋工业装备. 石油天然气钻采设备 was included but might not be understood by search crawlers.