# Relationship history for MSHA mine 4003024

Current hierarchy: **Watts Edward → Watts Mining Company Inc → No 26**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Massey Energy Company → No 26; 1976-09-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Watts Edward → No 26; 1988-03-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tennessee Consolidated Coal Company → No 26; 1990-01-01 to 1991-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Tennessee Consolidated Coal Company; 1990-01-01 to 1991-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Watts Mining Company Inc → No 26; 1991-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Watts Edward → Watts Mining Company Inc; 1991-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → No 26; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Tennessee Consolidated Coal Company; 2011-06-01 to 1991-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → No 26; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Tennessee Consolidated Coal Company; 2016-07-26 to 1991-07-21; source msha-controller-operator-history