# Relationship history for MSHA mine 1516555

Current hierarchy: **Salyers Frank Jr & Terry Cantrell → Camp Fork Fuel Company Inc → No6**

- 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:** Salyers Frank Jr & Terry Cantrell → No6; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horton Steve → No6; 1983-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ramblin Coal Company Inc → No6; 1989-02-01 to 1989-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Horton Steve → Ramblin Coal Company Inc; 1989-02-01 to 1989-07-23; source msha-controller-operator-history
- **operator_operates_mine:** Camp Fork Fuel Company Inc → No6; 1989-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Frank Jr & Terry Cantrell → Camp Fork Fuel Company Inc; 1989-07-24 to current/open; source msha-controller-operator-history