# Relationship history for MSHA mine 2902016

Current hierarchy: **Charles E  Hamilton; Carroll  Hamilton → James Hamilton Construction Co. → Crusher HW1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Charles E  Hamilton  et al → Crusher HW1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Asi-Concrete Products Inc → Crusher HW1; 1986-02-01 to 1989-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Ronald W  Southard → Crusher HW1; 1986-02-01 to 1989-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Ronald W  Southard → Asi-Concrete Products Inc; 1986-02-01 to 1989-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Hamilton Western Construction Inc → Crusher HW1; 1989-04-20 to 1995-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Hamilton → Crusher HW1; 1989-04-20 to 1995-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Hamilton → Hamilton Western Construction Inc; 1989-04-20 to 1995-04-04; source msha-controller-operator-history
- **operator_operates_mine:** James Hamilton Construction Co. → Crusher HW1; 1995-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles E  Hamilton  et al → James Hamilton Construction Co.; 1995-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carroll  Hamilton  et al → James Hamilton Construction Co.; 1995-04-05 to current/open; source msha-controller-operator-history