# Relationship history for MSHA mine 3303682

Current hierarchy: **Straub Glenn F → Ohio River Sand & Gravel → DILLES BOTTOM 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

- **controller_controls_mine:** Mc Donough Company → DILLES BOTTOM PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ohio River Sand & Gravel → DILLES BOTTOM PIT; 1978-03-09 to 1980-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Mc Donough Company → Ohio River Sand & Gravel; 1978-03-09 to 1980-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Ohio River Sand & Gravel → DILLES BOTTOM PIT; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Straub Glenn F → DILLES BOTTOM PIT; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Straub Glenn F → Ohio River Sand & Gravel; 1981-01-01 to current/open; source msha-controller-operator-history