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INVENTORY (Tables)
9 Months Ended
Sep. 30, 2021
INVENTORY  
Schedule of major classes of inventory

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September 30, 2021

    

December 31, 2020

Used serviceable materials

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$

68,222

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$

63,277

Work-in-process

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13,622

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20,611

Whole assets

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76,236

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56,767

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$

158,080

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​

140,655

Less short term

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(80,106)

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(85,192)

Long term

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$

77,974

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$

55,463