# Relationship history for MSHA mine 1507293

Current hierarchy: **Bill  Nichols → Wellaby Coal 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** United  Company → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chaney Cecil → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Hackney Creek Coal Company → No 1; 1974-08-26 to 1977-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Cecil → Little Hackney Creek Coal Company; 1974-08-26 to 1977-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Murray G Dale & Jan Gorgen → No 1; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Hackney Creek Coal Company → No 1; 1977-08-02 to 1980-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Murray G Dale & Jan Gorgen → Little Hackney Creek Coal Company; 1977-08-02 to 1980-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Energy Inc → No 1; 1980-02-27 to 1980-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Collins Ted → No 1; 1980-02-27 to 1980-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Collins Ted → Eagle Energy Inc; 1980-02-27 to 1980-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Smith Frank B → No 1; 1980-12-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Energy Inc → No 1; 1981-01-01 to 1983-03-16; source msha-controller-operator-history
- **controller_controls_operator:** Smith Frank B → Eagle Energy Inc; 1981-01-01 to 1983-03-16; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → No 1; 1983-03-17 to 1983-10-13; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1983-03-17 to 1983-10-13; source msha-controller-operator-history
- **operator_operates_mine:** Wellaby Coal Inc → No 1; 1983-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Nichols → No 1; 1983-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Nichols → Wellaby Coal Inc; 1983-10-14 to current/open; source msha-controller-operator-history