# Relationship history for MSHA mine 1518950

Current hierarchy: **Daniel W  Bunn → MEGA HIGHWALL MINING LLC → ADDCAR SYSTEMS 03**

- 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

- **controller_controls_mine:** Massey Energy Company → ADDCAR SYSTEMS 03; 1984-10-04 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Sidney Coal Company, Inc. → ADDCAR SYSTEMS 03; 2005-12-08 to 2018-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Sidney Coal Company, Inc.; 2005-12-08 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → ADDCAR SYSTEMS 03; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Sidney Coal Company, Inc.; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → ADDCAR SYSTEMS 03; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Sidney Coal Company, Inc.; 2016-07-26 to 2018-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Daniel W  Bunn → ADDCAR SYSTEMS 03; 2017-03-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** MEGA HIGHWALL MINING LLC → ADDCAR SYSTEMS 03; 2018-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel W  Bunn → MEGA HIGHWALL MINING LLC; 2018-02-16 to current/open; source msha-controller-operator-history