# Relationship history for MSHA mine 4606908

Current hierarchy: **Nelson David → Shannon Coal Company Inc → Shannon 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hays Dale E → Shannon Mine No 1; 1980-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Steel Hollow Mining Company → Shannon Mine No 1; 1985-03-01 to 1986-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Furr Danny H → Shannon Mine No 1; 1985-03-01 to 1986-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Furr Danny H → Steel Hollow Mining Company; 1985-03-01 to 1986-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Gateway Mining Company → Shannon Mine No 1; 1986-05-08 to 1987-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Caldwell Walter G → Shannon Mine No 1; 1986-05-08 to 1987-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Caldwell Walter G → Gateway Mining Company; 1986-05-08 to 1987-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Lite Coal Mining Company Inc → Shannon Mine No 1; 1987-07-09 to 1991-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Marsh Julia L → Shannon Mine No 1; 1987-07-09 to 1991-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Marsh Julia L → Lite Coal Mining Company Inc; 1987-07-09 to 1991-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Shannon Coal Company Inc → Shannon Mine No 1; 1991-08-06 to 1992-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Hays Dale E → Shannon Coal Company Inc; 1991-08-06 to 1992-02-20; source msha-controller-operator-history
- **operator_operates_mine:** Shannon Coal Company Inc → Shannon Mine No 1; 1992-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nelson David → Shannon Mine No 1; 1992-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nelson David → Shannon Coal Company Inc; 1992-02-21 to current/open; source msha-controller-operator-history