# Relationship history for MSHA mine 4002910

Current hierarchy: **Layne Norman D → N & N Coal Company Inc → No 46**

- 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 46; 1976-09-01 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Tennessee Consolidated Coal Company → No 46; 1986-01-01 to 1987-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Tennessee Consolidated Coal Company; 1986-01-01 to 1987-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Layne Norman D Et Al → No 46; 1986-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A & P Mining Company Inc → No 46; 1987-08-26 to 1989-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Patton John Anthony → No 46; 1987-08-26 to 1991-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Patton John Anthony → A & P Mining Company Inc; 1987-08-26 to 1989-02-05; source msha-controller-operator-history
- **operator_operates_mine:** N & N Coal Company Inc → No 46; 1989-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Layne Norman D Et Al → N & N Coal Company Inc; 1989-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → No 46; 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 1987-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → No 46; 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 1987-08-25; source msha-controller-operator-history