# Relationship history for MSHA mine 1509369

Current hierarchy: **Johnson Burl → Little Bit Coal Enterprises 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** B & F Coal Co → No 1; 1975-11-10 to 1976-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Burchett Fred → No 1; 1975-11-10 to 1977-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Burchett Fred → B & F Coal Co; 1975-11-10 to 1976-06-02; source msha-controller-operator-history
- **operator_operates_mine:** D H Coal Company → No 1; 1976-06-03 to 1977-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Hall Dewey → No 1; 1976-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Dewey → D H Coal Company; 1976-06-03 to 1977-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Maranatha Corp → No 1; 1977-02-08 to 1979-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Davis Gene → No 1; 1977-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Gene → Maranatha Corp; 1977-02-08 to 1979-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Little Bit Coal Enterprises Inc → No 1; 1979-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Burl → No 1; 1979-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Burl → Little Bit Coal Enterprises Inc; 1979-09-28 to current/open; source msha-controller-operator-history