# Relationship history for MSHA mine 2601719

Current hierarchy: **Shelton Les → Keeler Production Company → Keeler Production Company**

- 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

- **controller_controls_mine:** Drimmer Harold L → Keeler Production Company; 1977-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mt Hope Mining Corp → Keeler Production Company; 1981-02-01 to 1982-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Drimmer Harold L → Mt Hope Mining Corp; 1981-02-01 to 1982-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Keeler Production Company → Keeler Production Company; 1982-12-02 to 1984-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Skinner Gene → Keeler Production Company; 1982-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skinner Gene → Keeler Production Company; 1982-12-02 to 1984-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Keeler Production Company → Keeler Production Company; 1984-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shelton Les → Keeler Production Company; 1984-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shelton Les → Keeler Production Company; 1984-04-01 to current/open; source msha-controller-operator-history