# Relationship history for MSHA mine 1512069

Current hierarchy: **Salmons Carlos → Timper Mining Company Inc → No 2**

- 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:** Potter Billy D & Jimmy R Dotson → No 2; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chaffins Lionel-Bill-George Et Al → No 2; 1977-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Elk Coal Company → No 2; 1979-10-01 to 1987-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Chaffins Lionel-Bill-George Et Al → Elk Coal Company; 1979-10-01 to 1987-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Salmons Carlos → No 2; 1980-02-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & R Coal Company → No 2; 1987-09-24 to 1988-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Salmons Carlos → C & R Coal Company; 1987-09-24 to 1988-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Potter & Dotson Coal Company Inc → No 2; 1988-03-07 to 1991-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Potter Billy D & Jimmy R Dotson → Potter & Dotson Coal Company Inc; 1988-03-07 to 1991-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Timper Mining Company Inc → No 2; 1991-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Salmons Carlos → No 2; 1991-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salmons Carlos → Timper Mining Company Inc; 1991-07-22 to current/open; source msha-controller-operator-history