# Relationship history for MSHA mine 4001854

Current hierarchy: **Coal Acquisition Inc → Gay Coal Inc → No 7 Mine**

- 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:** Owens Curtis → No 7 Mine; 1950-01-01 to 1977-01-06; source msha-controller-operator-history
- **operator_operates_mine:** Gay Coal Inc → No 7 Mine; 1975-09-15 to 1976-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Owens Curtis → Gay Coal Inc; 1975-09-15 to 1976-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Pratt Tim → No 7 Mine; 1975-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wright Mining Company Inc → No 7 Mine; 1976-03-31 to 1978-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Pratt Tim → Wright Mining Company Inc; 1976-03-31 to 1978-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Coal Acquisition Inc → No 7 Mine; 1977-01-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gay Coal Inc → No 7 Mine; 1978-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Acquisition Inc → Gay Coal Inc; 1978-05-31 to current/open; source msha-controller-operator-history