# Relationship history for MSHA mine 3304398

Current hierarchy: **National Lime & Stone Co. → The National Lime & Stone Company → Ridge 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:** National Lime & Stone Co. → Ridge Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeffery J  Stansley et al → Ridge Quarry; 1991-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stansley Mineral Resources Inc → Ridge Quarry; 1997-04-01 to 2002-03-16; source msha-controller-operator-history
- **controller_controls_operator:** Jeffery J  Stansley et al → Stansley Mineral Resources Inc; 1997-04-01 to 2002-03-16; source msha-controller-operator-history
- **operator_operates_mine:** The National Lime & Stone Company → Ridge Quarry; 2002-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** National Lime & Stone Co. → The National Lime & Stone Company; 2002-03-17 to current/open; source msha-controller-operator-history