# Relationship history for MSHA mine 1517276

Current hierarchy: **K A  Helton → T & T Mining Inc → #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:** Middleton Darrell Et Al → #1; 1988-07-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Precieux Coals Inc → #1; 1992-08-01 to 1994-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Middleton Darrell Et Al → Precieux Coals Inc; 1992-08-01 to 1994-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Black Thunder Ltd → #1; 1994-02-16 to 1994-11-27; source msha-controller-operator-history
- **controller_controls_mine:** Montgomery Guy → #1; 1994-02-16 to 1995-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Montgomery Guy → Black Thunder Ltd; 1994-02-16 to 1994-11-27; source msha-controller-operator-history
- **operator_operates_mine:** Jml Mining Inc → #1; 1994-11-28 to 1995-04-10; source msha-controller-operator-history
- **controller_controls_mine:** White James → #1; 1994-11-28 to 1995-04-10; source msha-controller-operator-history
- **controller_controls_operator:** White James → Jml Mining Inc; 1994-11-28 to 1995-04-10; source msha-controller-operator-history
- **operator_operates_mine:** T & T Mining Inc → #1; 1995-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** K A  Helton → #1; 1995-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** K A  Helton → T & T Mining Inc; 1995-04-11 to current/open; source msha-controller-operator-history