กลไกใดมีการควบคุม lpm?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What mechanical has lpm regulation?It is not neccessary to use all the tables.
 table_1348246_3:  mechanical [ VARCHAR]  regulating [ VARCHAR] 
SELECT mechanical FROM table_1348246_3 WHERE regulating = "LPM"