# Relationship history for MSHA mine 1101896

Current hierarchy: **Michael  Themig; Debra  Themig → Vandalia Sand & Gravel Inc → Vandalia Sand & Gravel Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Hodson Brothers Inc → Vandalia Sand & Gravel Inc; 1950-01-01 to 1987-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Harry  Hodson → Vandalia Sand & Gravel Inc; 1950-01-01 to 1987-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Harry  Hodson → Hodson Brothers Inc; 1950-01-01 to 1987-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Vandalia Sand & Gravel Inc → Vandalia Sand & Gravel Inc; 1987-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Debra  Themig et al → Vandalia Sand & Gravel Inc; 1987-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Debra  Themig et al → Vandalia Sand & Gravel Inc; 1987-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Themig et al → Vandalia Sand & Gravel Inc; 1987-06-25 to current/open; source msha-controller-operator-history