# Relationship history for MSHA mine 0405041

Current hierarchy: **Buie Howard L Jr → Pasadena Rock & Sand → Pasadena Rock & Sand**

- 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:** R T D Rock & Sand → Pasadena Rock & Sand; 1989-06-01 to 1989-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Smith Randolph Et Al → Pasadena Rock & Sand; 1989-06-01 to 1989-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Smith Randolph Et Al → R T D Rock & Sand; 1989-06-01 to 1989-12-20; source msha-controller-operator-history
- **operator_operates_mine:** Bj'S Rock & Sand → Pasadena Rock & Sand; 1989-12-21 to 1991-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Combs James S → Pasadena Rock & Sand; 1989-12-21 to 1991-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Combs James S → Bj'S Rock & Sand; 1989-12-21 to 1991-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Pasadena Rock & Sand → Pasadena Rock & Sand; 1991-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Buie Howard L Jr → Pasadena Rock & Sand; 1991-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buie Howard L Jr → Pasadena Rock & Sand; 1991-01-30 to current/open; source msha-controller-operator-history