# Relationship history for MSHA mine 3300056

Current hierarchy: **National Lime & Stone Co. → National Lime & Stone Co. → Delphos Plant**

- 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. → Delphos Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Delphos Quarries Company → Delphos Plant; 1950-01-01 to 1984-12-05; source msha-controller-operator-history
- **controller_controls_mine:** Norman  Vinson → Delphos Plant; 1950-01-01 to 1984-12-05; source msha-controller-operator-history
- **controller_controls_operator:** Norman  Vinson → Delphos Quarries Company; 1950-01-01 to 1984-12-05; source msha-controller-operator-history
- **controller_controls_mine:** Neal A  Lause → Delphos Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Suever Stone Company → Delphos Plant; 1984-12-06 to 2007-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Neal A  Lause → Suever Stone Company; 1984-12-06 to 2007-04-17; source msha-controller-operator-history
- **operator_operates_mine:** National Lime & Stone Co. → Delphos Plant; 2007-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** National Lime & Stone Co. → National Lime & Stone Co.; 2007-04-18 to current/open; source msha-controller-operator-history