# Relationship history for MSHA mine 4500951

Current hierarchy: **Walt  Miles → Miles Sand & Gravel Company → Island County RM**

- 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:** Walt  Miles et al → Island County RM; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Everett Brothers Construction Company → Island County RM; 1950-01-01 to 1982-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Harold R  Everett → Island County RM; 1950-01-01 to 1982-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Harold R  Everett → Everett Brothers Construction Company; 1950-01-01 to 1982-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Everett Brothers Construction Company → Island County RM; 1983-01-01 to 1990-05-16; source msha-controller-operator-history
- **controller_controls_mine:** Richard J  Lange → Island County RM; 1983-01-01 to 1990-05-16; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Lange → Everett Brothers Construction Company; 1983-01-01 to 1990-05-16; source msha-controller-operator-history
- **controller_controls_mine:** Walt  Miles et al → Island County RM; 1983-04-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Krieg Concrete Products Inc → Island County RM; 1990-05-17 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Darlyne A  Krieg et al → Island County RM; 1990-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darlyne A  Krieg et al → Krieg Concrete Products Inc; 1990-05-17 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Karl C  Krieg III  et al → Krieg Concrete Products Inc; 1990-05-17 to 2012-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Concrete Nor'West → Island County RM; 2013-01-01 to 2016-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Walt  Miles et al → Concrete Nor'West; 2013-01-01 to 2016-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Miles Sand & Gravel Company → Island County RM; 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