# Relationship history for MSHA mine 1001249

Current hierarchy: **Smith Duane B → Lazy 7 Inc → Heather/Kaydee Pit**

- 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

- **operator_operates_mine:** Lake Fork Gravel Inc → Heather/Kaydee Pit; 1950-01-01 to 1987-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Chesney Charles L → Heather/Kaydee Pit; 1950-01-01 to 1987-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Chesney Charles L → Lake Fork Gravel Inc; 1950-01-01 to 1987-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Lazy 7 Inc → Heather/Kaydee Pit; 1987-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Duane B → Heather/Kaydee Pit; 1987-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Duane B → Lazy 7 Inc; 1987-07-29 to current/open; source msha-controller-operator-history