# Relationship history for MSHA mine 1102742

Current hierarchy: **Peter E  Powell → Galena Road Gravel Inc. → Lacon 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:** Jerry  Henry → Lacon Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid-West Sand & Gravel Inc → Lacon Plant; 1980-05-01 to 1993-04-13; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Henry → Mid-West Sand & Gravel Inc; 1980-05-01 to 1993-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Peter E  Powell → Lacon Plant; 1991-01-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Midwest Material Company → Lacon Plant; 1993-04-14 to 1996-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Williams → Lacon 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 → Lacon Plant; 1996-12-10 to 2017-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Richard J  Walsh → Lacon 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 2017-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Galena Road Gravel Inc. → Lacon Plant; 2017-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter E  Powell → Galena Road Gravel Inc.; 2017-07-15 to current/open; source msha-controller-operator-history