Science project equipment subject to change bulbs. Intended purpose 1) to change the bulb from the beater 2) to test the efficiency of the device changes the light bulbs that can be changed in all 3) to query for user satisfaction beater accessories to change bulbs. By placing a device change bulbs how to do the following: Apply wood beater and cut the header, which is steel and plastic pipes PVC, taken from section 2 are cut is taken with PVC plastic pipe joints by a specific random. Questionnaire user satisfaction. The device changes the bulbs to collect and analyze data using statistical values, such as the arithmetic mean (X ̅) and standard deviation (S.D.)
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