# Relationship history for MSHA mine 4503177

Current hierarchy: **Sterling  Griffin → Harbor Custom Homes L.L.C. → Bremerton 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Richard N  Christopherson → Bremerton Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ace Paving Company Inc → Bremerton Quarry; 1989-07-01 to 2018-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Richard N  Christopherson → Ace Paving Company Inc; 1989-07-01 to 2018-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Harbor Custom Homes L.L.C. → Bremerton Quarry; 2018-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sterling  Griffin → Bremerton Quarry; 2018-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sterling  Griffin → Harbor Custom Homes L.L.C.; 2018-03-19 to current/open; source msha-controller-operator-history