# Relationship history for MSHA mine 2002863

Current hierarchy: **Robert  De Jong → Great Lakes Gravel → GREAT LAKES GRAVEL**

- 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:** Alice  Veldkamp → GREAT LAKES GRAVEL; 1985-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Great Lakes Gravel → GREAT LAKES GRAVEL; 1991-07-01 to 1991-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Alice  Veldkamp → Great Lakes Gravel; 1991-07-01 to 1991-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Great Lakes Gravel → GREAT LAKES GRAVEL; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  De Jong → GREAT LAKES GRAVEL; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  De Jong → Great Lakes Gravel; 1992-01-01 to current/open; source msha-controller-operator-history