# Relationship history for MSHA mine 4502733

Current hierarchy: **Walt  Miles → Port Orchard Sand & Gravel Company Inc → BREM ROCK**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Walt  Miles et al → BREM ROCK; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brem Rock Inc → BREM ROCK; 1979-01-01 to 1981-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Walter J  Goit → BREM ROCK; 1979-01-01 to 1985-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Walter J  Goit → Brem Rock Inc; 1979-01-01 to 1981-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Brem-Rock Inc → BREM ROCK; 1981-08-27 to 1986-01-29; source msha-controller-operator-history
- **controller_controls_mine:** William F  Cusick → BREM ROCK; 1981-08-27 to 1986-01-29; source msha-controller-operator-history
- **controller_controls_operator:** William F  Cusick → Brem-Rock Inc; 1981-08-27 to 1986-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Port Orchard Sand & Gravel Company Inc → BREM ROCK; 1986-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walt  Miles et al → Port Orchard Sand & Gravel Company Inc; 1986-01-30 to current/open; source msha-controller-operator-history