# Relationship history for MSHA mine 4406338

Current hierarchy: **Darrell  Grigsby → Energy Sales Inc → Energy Plant #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** J A M Coal Company Inc → Energy Plant #1; 1986-10-01 to 1988-10-26; source msha-controller-operator-history
- **controller_controls_mine:** King Donald O → Energy Plant #1; 1986-10-01 to 1988-10-26; source msha-controller-operator-history
- **controller_controls_operator:** King Donald O → J A M Coal Company Inc; 1986-10-01 to 1988-10-26; source msha-controller-operator-history
- **operator_operates_mine:** Roaring Fork Coal Company → Energy Plant #1; 1988-10-27 to 1991-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Bowersmith John → Energy Plant #1; 1988-10-27 to 1991-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Bowersmith John → Roaring Fork Coal Company; 1988-10-27 to 1991-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Energy Sales Inc → Energy Plant #1; 1991-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darrell  Grigsby → Energy Plant #1; 1991-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Grigsby → Energy Sales Inc; 1991-07-19 to current/open; source msha-controller-operator-history