# Relationship history for MSHA mine 4606706

Current hierarchy: **Richard H  Abraham → Expansion Mining Company Inc → Model No 4**

- 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 → Model No 4; 1950-01-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard H  Abraham et al → Model No 4; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Omar Mining Company → Model No 4; 1983-10-01 to 1985-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Omar Mining Company; 1983-10-01 to 1985-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Expansion Mining Company Inc → Model No 4; 1985-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Abraham et al → Expansion Mining Company Inc; 1985-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Model No 4; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Omar Mining Company; 2011-06-01 to 1985-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Model No 4; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Omar Mining Company; 2016-07-26 to 1985-09-11; source msha-controller-operator-history