# Relationship history for MSHA mine 4500605

Current hierarchy: **Walt  Miles → Miles Sand & Gravel Company → Samish 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

- **operator_operates_mine:** Concrete Nor'West Inc → Samish Pit; 1950-01-01 to 1985-08-07; source msha-controller-operator-history
- **controller_controls_mine:** M J  Mc Intyre → Samish Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M J  Mc Intyre → Concrete Nor'West Inc; 1950-01-01 to 1985-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Walt  Miles et al → Samish Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walt  Miles et al → Samish Pit; 1983-04-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Concrete Nor'West → Samish Pit; 1985-08-08 to 2016-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Walt  Miles et al → Concrete Nor'West; 1985-08-08 to 2016-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Miles Sand & Gravel Company → Samish Pit; 2016-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walt  Miles et al → Miles Sand & Gravel Company; 2016-06-01 to current/open; source msha-controller-operator-history