# Relationship history for MSHA mine 3608718

Current hierarchy: **Waste Management Inc → Alliance Landfill, Inc. → Area A2A**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** American Asphalt Paving Company → Area A2A; 1998-08-01 to 2004-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Waste Management Inc → Area A2A; 1998-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Waste Management Inc → American Asphalt Paving Company; 1998-08-01 to 2004-06-28; source msha-controller-operator-history
- **operator_operates_mine:** National Earth Services Inc. → Area A2A; 2004-06-29 to 2012-05-24; source msha-controller-operator-history
- **controller_controls_mine:** Charles H  Gearhart → Area A2A; 2004-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles H  Gearhart → National Earth Services Inc.; 2004-06-29 to 2012-05-24; source msha-controller-operator-history
- **operator_operates_mine:** Alliance Landfill, Inc. → Area A2A; 2012-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Waste Management Inc → Area A2A; 2012-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Waste Management Inc → Alliance Landfill, Inc.; 2012-05-25 to current/open; source msha-controller-operator-history