# Relationship history for MSHA mine 4600002

Current hierarchy: **Allen E  Williams → Allegany Quarries → ALLEGANY QUARRIES, A DIV OF T.G.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Allegany Quarries Inc → ALLEGANY QUARRIES, A DIV OF T.G.; 1950-01-01 to 1985-11-28; source msha-controller-operator-history
- **controller_controls_mine:** Green Lloyd → ALLEGANY QUARRIES, A DIV OF T.G.; 1950-01-01 to 1985-11-28; source msha-controller-operator-history
- **controller_controls_operator:** Green Lloyd → Allegany Quarries Inc; 1950-01-01 to 1985-11-28; source msha-controller-operator-history
- **operator_operates_mine:** Allegany Quarries → ALLEGANY QUARRIES, A DIV OF T.G.; 1985-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Allen E  Williams → ALLEGANY QUARRIES, A DIV OF T.G.; 1985-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen E  Williams → Allegany Quarries; 1985-11-29 to current/open; source msha-controller-operator-history