# Relationship history for MSHA mine 0801131

Current hierarchy: **William H  Ryan; William J  Ryan → Ryan Sales & Service → LOX ROAD 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

- **operator_operates_mine:** Hardrives Company → LOX ROAD QUARRY; 1989-07-01 to 1991-10-21; source msha-controller-operator-history
- **controller_controls_mine:** John W  Nutbrown → LOX ROAD QUARRY; 1989-07-01 to 1991-10-21; source msha-controller-operator-history
- **controller_controls_operator:** John W  Nutbrown → Hardrives Company; 1989-07-01 to 1991-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Ryan Sales & Service → LOX ROAD QUARRY; 1991-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William J  Ryan Et Al → LOX ROAD QUARRY; 1991-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J  Ryan Et Al → Ryan Sales & Service; 1991-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William H  Ryan Et Al → Ryan Sales & Service; 1991-10-22 to current/open; source msha-controller-operator-history