# Relationship history for MSHA mine 1800667

Current hierarchy: **Chaney Enterprises LP; Reliable Contracting Co Inc → Resource Conservation Group → Tolson 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Cunningham Sand & Gravel → Tolson Pit; 1979-01-01 to 2015-01-13; source msha-controller-operator-history
- **controller_controls_mine:** James  Cunningham → Tolson Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Cunningham → Cunningham Sand & Gravel; 1979-01-01 to 2015-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Resource Conservation Group → Tolson Pit; 2015-01-14 to 2015-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Reliable Contracting Co Inc et al → Tolson Pit; 2015-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reliable Contracting Co Inc et al → Resource Conservation Group; 2015-01-14 to 2015-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Enterprises LP et al → Resource Conservation Group; 2015-01-14 to 2015-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Resource Conservation Group → Tolson Pit; 2015-03-25 to 2015-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Tolson and Associates LLC → Tolson Pit; 2015-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tolson and Associates LLC → Resource Conservation Group; 2015-03-25 to 2015-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Resource Conservation Group → Tolson Pit; 2015-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Enterprises LP et al → Resource Conservation Group; 2015-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reliable Contracting Co Inc et al → Resource Conservation Group; 2015-03-26 to current/open; source msha-controller-operator-history