# Relationship history for MSHA mine 2300285

Current hierarchy: **Leo  O'Laughlin → Leo O'Laughlin Inc → LEO O'LAUGHLIN INC**

- 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:** O'Laughlin Quarry Inc → LEO O'LAUGHLIN INC; 1950-01-01 to 1989-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Charles  O'Laughlin → LEO O'LAUGHLIN INC; 1950-01-01 to 1989-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Charles  O'Laughlin → O'Laughlin Quarry Inc; 1950-01-01 to 1989-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Leo O'Laughlin Inc → LEO O'LAUGHLIN INC; 1989-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leo  O'Laughlin → LEO O'LAUGHLIN INC; 1989-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leo  O'Laughlin → Leo O'Laughlin Inc; 1989-05-30 to current/open; source msha-controller-operator-history