# Relationship history for MSHA mine 4502582

Current hierarchy: **Walt  Miles → Concrete Nor'West → POLE ROAD PIT**

- 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:** Larry  Van Werven → POLE ROAD PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ferndale Ready Mix & Gravel Inc → POLE ROAD PIT; 1978-03-09 to 1990-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Van Werven → Ferndale Ready Mix & Gravel Inc; 1978-03-09 to 1990-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Walt  Miles et al → POLE ROAD PIT; 1983-04-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Concrete Nor'West → POLE ROAD PIT; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walt  Miles et al → Concrete Nor'West; 1990-07-01 to current/open; source msha-controller-operator-history