# Relationship history for MSHA mine 1513181

Current hierarchy: **Potter Gordon → Marathon Mining Corp → 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:** France Kermit & Stanley Osborne → No 1; 1977-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Potter Gordon → No 1; 1979-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Ridge Coal Company → No 1; 1981-10-01 to 1983-06-06; source msha-controller-operator-history
- **controller_controls_operator:** France Kermit & Stanley Osborne → Laurel Ridge Coal Company; 1981-10-01 to 1983-06-06; source msha-controller-operator-history
- **operator_operates_mine:** M D M Coal Corp → No 1; 1983-06-07 to 1987-10-22; source msha-controller-operator-history
- **controller_controls_mine:** John E  Potter et al → No 1; 1983-06-07 to 1987-10-22; source msha-controller-operator-history
- **controller_controls_operator:** John E  Potter et al → M D M Coal Corp; 1983-06-07 to 1987-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Lucky Dollar Coal Company Inc → No 1; 1987-10-23 to 1988-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Skeens Stanley → No 1; 1987-10-23 to 1988-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Skeens Stanley → Lucky Dollar Coal Company Inc; 1987-10-23 to 1988-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Marathon Coal Corp → No 1; 1988-05-13 to 1989-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Potter Gordon → Marathon Coal Corp; 1988-05-13 to 1989-09-28; source msha-controller-operator-history
- **operator_operates_mine:** Imperial Mining Inc → No 1; 1989-09-29 to 1990-08-15; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Roger → No 1; 1989-09-29 to 1990-08-15; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Roger → Imperial Mining Inc; 1989-09-29 to 1990-08-15; source msha-controller-operator-history
- **operator_operates_mine:** Marathon Mining Corp → No 1; 1990-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Potter Gordon → No 1; 1990-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Potter Gordon → Marathon Mining Corp; 1990-08-16 to current/open; source msha-controller-operator-history