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The figure shows how:
The broadband service appears in Gordon's commercial and technical inventory and is correlated with a TechnicalInventoryId of 1.
The broadband modem appears in Gordon and TruGreen's commercial and technical inventories and is correlated with a TechnicalInventoryId of 2.
The DSLAM that supports Gordon's broadband service appears in TruGreen's commercial and technical inventory and is correlated with a TechnicalInventoryId of 3.