# Relationship history for MSHA mine 4604427

Current hierarchy: **Abram Daniel → Black Bear Coal Company → Black Bear Mine No 1**

- 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:** Groves S J & Sons Company → Black Bear Mine No 1; 1974-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Bear Coal Company → Black Bear Mine No 1; 1974-12-01 to 1978-09-13; source msha-controller-operator-history
- **controller_controls_mine:** Beury Robert N → Black Bear Mine No 1; 1974-12-01 to 1978-09-13; source msha-controller-operator-history
- **controller_controls_operator:** Beury Robert N → Black Bear Coal Company; 1974-12-01 to 1978-09-13; source msha-controller-operator-history
- **operator_operates_mine:** Gopher Mining Company → Black Bear Mine No 1; 1978-09-14 to 1979-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Groves S J & Sons Company → Gopher Mining Company; 1978-09-14 to 1979-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Black Bear Coal Company Inc → Black Bear Mine No 1; 1979-06-07 to 1982-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Graybeal Carl N Et Al → Black Bear Mine No 1; 1979-06-07 to 1982-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Graybeal Carl N Et Al → Black Bear Coal Company Inc; 1979-06-07 to 1982-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Black Bear Coal Company → Black Bear Mine No 1; 1982-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Abram Daniel → Black Bear Mine No 1; 1982-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Abram Daniel → Black Bear Coal Company; 1982-06-15 to current/open; source msha-controller-operator-history