# Relationship history for MSHA mine 4404778

Current hierarchy: **Presley Leon-Stanley Ward → K W Carbon 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:** Keen Elmer → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Potter Billy D & Jimmy R Dotson → No 1; 1976-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Potter & Dotson Coal Company Inc → No 1; 1977-07-01 to 1979-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Potter Billy D & Jimmy R Dotson → Potter & Dotson Coal Company Inc; 1977-07-01 to 1979-05-23; source msha-controller-operator-history
- **operator_operates_mine:** Left Fork Coal Company Inc → No 1; 1979-05-24 to 1982-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Keen Elmer → Left Fork Coal Company Inc; 1979-05-24 to 1982-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Presley Leon-Stanley Ward Et Al → No 1; 1982-04-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K W Carbon Inc → No 1; 1982-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Presley Leon-Stanley Ward Et Al → K W Carbon Inc; 1982-06-01 to current/open; source msha-controller-operator-history