# Relationship history for MSHA mine 4104661

Current hierarchy: **Michael D  Smith → LS Sand & Gravel LTD. → Mansfield**

- 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:** Michael D  Smith → Mansfield; 2002-04-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** LS Sand & Gravel LTD. → Mansfield; 2007-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Smith → LS Sand & Gravel LTD.; 2007-04-02 to current/open; source msha-controller-operator-history