# Relationship history for MSHA mine 0503930

Current hierarchy: **Edward C  Levy Jr → Centennial Materials Company → CASTLE ROCK QUARRY**

- 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:** Hallett Construction Company → CASTLE ROCK QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shelton Stanley E → CASTLE ROCK QUARRY; 1982-10-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Castle Rock Aggregates → CASTLE ROCK QUARRY; 1984-02-01 to 1984-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Shelton Stanley E → Castle Rock Aggregates; 1984-02-01 to 1984-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Construction Company → CASTLE ROCK QUARRY; 1984-08-08 to 1986-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Hallett Construction Company → Hallett Construction Company; 1984-08-08 to 1986-10-13; source msha-controller-operator-history
- **controller_controls_mine:** Mid America Materials Company → CASTLE ROCK QUARRY; 1986-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials → CASTLE ROCK QUARRY; 1986-10-14 to 1991-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Mid America Materials Company → Hallett Materials; 1986-10-14 to 1991-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Centennial Materials Company → CASTLE ROCK QUARRY; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edward C  Levy Jr et al → CASTLE ROCK QUARRY; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward C  Levy Jr et al → Centennial Materials Company; 1991-05-01 to current/open; source msha-controller-operator-history