# Relationship history for MSHA mine 4000525

Current hierarchy: **Parker James B → L & A Coal Company → No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Phillips & West Coal Corp → No 1 Mine; 1950-01-01 to 1977-07-17; source msha-controller-operator-history
- **controller_controls_mine:** West W O → No 1 Mine; 1950-01-01 to 1977-07-17; source msha-controller-operator-history
- **controller_controls_operator:** West W O → Phillips & West Coal Corp; 1950-01-01 to 1977-07-17; source msha-controller-operator-history
- **operator_operates_mine:** L & A Coal Company → No 1 Mine; 1977-07-18 to 1978-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Laxton Lautin → No 1 Mine; 1977-07-18 to 1978-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Laxton Lautin → L & A Coal Company; 1977-07-18 to 1978-06-04; source msha-controller-operator-history
- **operator_operates_mine:** L & A Coal Company → No 1 Mine; 1978-06-05 to 1979-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Kelley Don S → No 1 Mine; 1978-06-05 to 1979-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Kelley Don S → L & A Coal Company; 1978-06-05 to 1979-06-11; source msha-controller-operator-history
- **operator_operates_mine:** L & A Coal Company → No 1 Mine; 1979-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Parker James B → No 1 Mine; 1979-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Parker James B → L & A Coal Company; 1979-06-12 to current/open; source msha-controller-operator-history