# Relationship history for MSHA mine 1102604

Current hierarchy: **Richard J  Walsh → Midwest Material Company → Henry 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

- **operator_operates_mine:** Mid-West Sand & Gravel Inc → Henry Plant; 1950-01-01 to 1993-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Henry → Henry Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Henry → Mid-West Sand & Gravel Inc; 1950-01-01 to 1993-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Midwest Material Company → Henry Plant; 1993-04-14 to 1996-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Williams → Henry Plant; 1993-04-14 to 1996-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Williams → Midwest Material Company; 1993-04-14 to 1996-12-09; source msha-controller-operator-history
- **operator_operates_mine:** Midwest Material Company → Henry Plant; 1996-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard J  Walsh → Henry Plant; 1996-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Walsh → Midwest Material Company; 1996-12-10 to current/open; source msha-controller-operator-history