# Relationship history for MSHA mine 1517881

Current hierarchy: **Robert B  Hughes → S & B Energy, 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

- **controller_controls_mine:** Stiltner Ralph → No 1; 1984-05-30 to 1985-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Chele Energy Inc → No 1; 1996-12-01 to 2004-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Robert B  Hughes → No 1; 1996-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert B  Hughes → Chele Energy Inc; 1996-12-01 to 2004-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Robert B  Hughes → No 1; 2004-09-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & B Energy, Inc. → No 1; 2004-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stiltner Ralph → S & B Energy, Inc.; 2004-09-17 to 1985-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Robert B  Hughes → S & B Energy, Inc.; 2004-09-17 to current/open; source msha-controller-operator-history