# Relationship history for MSHA mine 1510271

Current hierarchy: **Clark D  Pergrem → N F C MINING, INC. → #1 PLANT**

- 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:** Jack  Ruth → #1 PLANT; 1975-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** East Kentucky Paving Corp → #1 PLANT; 1977-02-01 to 1984-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Ruth → East Kentucky Paving Corp; 1977-02-01 to 1984-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Cabin Coal Corp → #1 PLANT; 1984-04-06 to 1989-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Sims → #1 PLANT; 1984-04-06 to 1989-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Sims → Cabin Coal Corp; 1984-04-06 to 1989-04-19; source msha-controller-operator-history
- **operator_operates_mine:** South Lake Processing → #1 PLANT; 1989-04-20 to 1997-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Whitt → #1 PLANT; 1989-04-20 to 1997-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Whitt → South Lake Processing; 1989-04-20 to 1997-01-29; source msha-controller-operator-history
- **operator_operates_mine:** N F C Mining, Inc. → #1 PLANT; 1997-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clark D  Pergrem → #1 PLANT; 1997-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clark D  Pergrem → N F C Mining, Inc.; 1997-01-30 to current/open; source msha-controller-operator-history