# Relationship history for MSHA mine 4404845

Current hierarchy: **Carl  Davis → D & P Coal Company Inc → 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:** Wolford Michael A & Steve → No 1; 1977-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & C Coal Company Inc → No 1; 1977-09-01 to 1979-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Estel  Crouse et al → No 1; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estel  Crouse et al → K & C Coal Company Inc; 1977-09-01 to 1979-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Boyd  Keen et al → K & C Coal Company Inc; 1977-09-01 to 1979-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Triple W Coal Company Inc → No 1; 1979-08-30 to 1979-11-26; source msha-controller-operator-history
- **controller_controls_operator:** Wolford Michael A & Steve → Triple W Coal Company Inc; 1979-08-30 to 1979-11-26; source msha-controller-operator-history
- **operator_operates_mine:** D & P Coal Company Inc → No 1; 1979-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl  Davis → No 1; 1979-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Davis → D & P Coal Company Inc; 1979-11-27 to current/open; source msha-controller-operator-history