# Relationship history for MSHA mine 2104013

Current hierarchy: **Bruce A  Smith → Smitty's Ready Mix of Barnum Inc. → Smitty's-Ready Mix of Barnum Inc.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Smitty's Ready Mix of Barnum Inc. → Smitty's-Ready Mix of Barnum Inc.; 2021-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bruce A  Smith → Smitty's-Ready Mix of Barnum Inc.; 2021-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce A  Smith → Smitty's Ready Mix of Barnum Inc.; 2021-07-26 to current/open; source msha-controller-operator-history