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BUSINESS SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenues |  |  |  |
Revenues | $ 5,360 | $ 3,877 | $ 8,378 | $ 10,122
Depreciation and Amortization | 88 | 480 | 172 | 966
Operating Income | (1,550) | (1,558) | (2,993) | (2,697)
T And D Segment [Member] |  |  |  |
Revenues |  |  |  |
Switchgear | 2,737 | 883 | 3,810 | 4,585
Revenues | 2,737 | 883 | 3,810 | 4,585
Depreciation and Amortization | 37 | 90 | 71 | 181
Operating Income | (542) | (719) | (775) | (565)
Critical Power Segment [Member] |  |  |  |
Revenues |  |  |  |
Equipment | 267 | 402 | 441 | 784
Service | 2,356 | 2,592 | 4,127 | 4,753
Revenues | 2,623 | 2,994 | 4,568 | 5,537
Depreciation and Amortization | 37 | 374 | 73 | 753
Operating Income | 252 | (234) | (148) | (673)
Unallocated Corporate Overhead Expenses [Member] |  |  |  |
Revenues |  |  |  |
Depreciation and Amortization | 14 | 16 | 28 | 32
Operating Income | $ (1,260) | $ (605) | $ (2,070) | $ (1,459)

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