# Relationship history for MSHA mine 1601533

Current hierarchy: **Craig S.  Mears → Mears Sand & Gravel, LLC → Thames Plant**

- 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:** Craig S.  Mears → Thames Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mears Sand & Gravel, LLC → Thames Plant; 2013-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig S.  Mears → Mears Sand & Gravel, LLC; 2013-10-02 to current/open; source msha-controller-operator-history