# Relationship history for MSHA mine 0405646

Current hierarchy: **Timmothy A  Hooven; Patrick D  Hooven → Mason Materials LLC → Mason Materials**

- 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

- **operator_operates_mine:** Mason Materials LLC → Mason Materials; 2005-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timmothy A  Hooven et al → Mason Materials; 2005-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timmothy A  Hooven et al → Mason Materials LLC; 2005-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick D  Hooven et al → Mason Materials LLC; 2005-06-15 to current/open; source msha-controller-operator-history