# Relationship history for MSHA mine 3302115

Current hierarchy: **Colas S A → Barrett Paving Materials Inc → Vandemark Quarry**

- 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:** Barhorst Nelson E Et Al → Vandemark Quarry; 1950-01-01 to 2000-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → Vandemark Quarry; 1979-12-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Spring Creek Corp → Vandemark Quarry; 1985-07-01 to 2005-03-27; source msha-controller-operator-history
- **controller_controls_operator:** Barhorst Nelson E Et Al → Spring Creek Corp; 1985-07-01 to 2000-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → Vandemark Quarry; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Spring Creek Corp; 2000-04-01 to 2005-03-27; source msha-controller-operator-history
- **operator_operates_mine:** Barrett Paving Materials Inc → Vandemark Quarry; 2005-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Barrett Paving Materials Inc; 2005-03-28 to current/open; source msha-controller-operator-history