# Relationship history for MSHA mine 1508605

Current hierarchy: **Turner Charles & Bobby Joe Hensley → Day Branch Coal Company Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Spurlock Ralph → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Melvin  Taylor → No 1 Mine; 1973-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C C C Coal Company → No 1 Mine; 1975-08-01 to 1976-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Spurlock Ralph → C C C Coal Company; 1975-08-01 to 1976-07-31; source msha-controller-operator-history
- **operator_operates_mine:** T & M Coal Corp → No 1 Mine; 1976-08-01 to 1977-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Melvin  Taylor → T & M Coal Corp; 1976-08-01 to 1977-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Day Branch Coal Company Inc → No 1 Mine; 1977-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Turner Charles & Bobby Joe Hensley → No 1 Mine; 1977-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Turner Charles & Bobby Joe Hensley → Day Branch Coal Company Inc; 1977-02-02 to current/open; source msha-controller-operator-history