# Relationship history for MSHA mine 3303812

Current hierarchy: **Puskarich Nick J → Cravat Coal Company → Conotton Valley Quarries - South**

- 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:** Mc Donough Company → Conotton Valley Quarries - South; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ohio River Sand & Gravel → Conotton Valley Quarries - South; 1980-02-01 to 1981-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Mc Donough Company → Ohio River Sand & Gravel; 1980-02-01 to 1981-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Cravat Coal Company → Conotton Valley Quarries - South; 1981-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Puskarich Nick J → Conotton Valley Quarries - South; 1981-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Puskarich Nick J → Cravat Coal Company; 1981-04-28 to current/open; source msha-controller-operator-history