# Relationship history for MSHA mine 3503392

Current hierarchy: **Weiss Larry → Jasper Quarry Rock Products → JASPER QUARRY ROCK PRODUCTS**

- 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:** Oregon Rock Products Inc → JASPER QUARRY ROCK PRODUCTS; 1993-06-01 to 1997-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Covert → JASPER QUARRY ROCK PRODUCTS; 1993-06-01 to 1997-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Covert → Oregon Rock Products Inc; 1993-06-01 to 1997-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Jasper Quarry Rock Products → JASPER QUARRY ROCK PRODUCTS; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Weiss Larry → JASPER QUARRY ROCK PRODUCTS; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weiss Larry → Jasper Quarry Rock Products; 1997-04-01 to current/open; source msha-controller-operator-history