# Relationship history for MSHA mine 3606335

Current hierarchy: **Gerald T  Jarrett; Troy A  Jarrett → B J Coal Company → B J Coal Co**

- 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 J Coal Company → B J Coal Co; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gerald T  Jarrett et al → B J Coal Co; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald T  Jarrett et al → B J Coal Company; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy A  Jarrett et al → B J Coal Company; 1977-01-01 to current/open; source msha-controller-operator-history