# Relationship history for MSHA mine 4405549

Current hierarchy: **Davis Jerry M → Edison Coal Company Inc → 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

- **operator_operates_mine:** Edison Coal Company Inc → Mine No 1; 1980-11-01 to 1981-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Marshall Banner → Mine No 1; 1980-11-01 to 1981-11-11; source msha-controller-operator-history
- **controller_controls_operator:** Marshall Banner → Edison Coal Company Inc; 1980-11-01 to 1981-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Edison Coal Company Inc → Mine No 1; 1981-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis Jerry M Et Al → Mine No 1; 1981-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Jerry M Et Al → Edison Coal Company Inc; 1981-11-01 to current/open; source msha-controller-operator-history