# Relationship history for MSHA mine 4501162

Current hierarchy: **Shovell Robert & Wesley → Shovell Limestone → Shovell Limestone**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Smith Limestone → Shovell Limestone; 1950-01-01 to 1984-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Smith Gerald A Et Al → Shovell Limestone; 1950-01-01 to 1984-08-28; source msha-controller-operator-history
- **controller_controls_operator:** Smith Gerald A Et Al → Smith Limestone; 1950-01-01 to 1984-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Shovell Limestone → Shovell Limestone; 1984-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shovell Robert & Wesley → Shovell Limestone; 1984-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shovell Robert & Wesley → Shovell Limestone; 1984-08-29 to current/open; source msha-controller-operator-history