# Relationship history for MSHA mine 4104614

Current hierarchy: **Michael  Hill; Hank  Deshazer → Smithville Sand & Gravel, LP → Smithville Sand & Gravel, LP (Portable)**

- 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:** Smithville Sand & Gravel, LP → Smithville Sand & Gravel, LP (Portable); 2006-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Hill et al → Smithville Sand & Gravel, LP (Portable); 2006-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Hill et al → Smithville Sand & Gravel, LP; 2006-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hank  Deshazer et al → Smithville Sand & Gravel, LP; 2006-07-31 to current/open; source msha-controller-operator-history