# Relationship history for MSHA mine 4403602

Current hierarchy: **V D  Kendrick → Kendrick Quarry → Kendrick 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

- **operator_operates_mine:** D W L Inc → Kendrick Quarry; 1950-01-01 to 1979-03-04; source msha-controller-operator-history
- **controller_controls_mine:** W-L Construction & Paving Inc → Kendrick Quarry; 1950-01-01 to 1998-12-31; source msha-controller-operator-history
- **controller_controls_operator:** W-L Construction & Paving Inc → D W L Inc; 1950-01-01 to 1979-03-04; source msha-controller-operator-history
- **operator_operates_mine:** Kendrick Quarry → Kendrick Quarry; 1979-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** V D  Kendrick → Kendrick Quarry; 1979-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** V D  Kendrick → Kendrick Quarry; 1979-03-05 to current/open; source msha-controller-operator-history