# Relationship history for MSHA mine 4502698

Current hierarchy: **David  Lenhart → Snohomish Rock Products → Pilchuck 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Builders Rock Inc → Pilchuck Pit; 1979-01-01 to 1980-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Morey → Pilchuck Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Morey → Builders Rock Inc; 1979-01-01 to 1980-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Snohomish Rock Products → Pilchuck Pit; 1980-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Lenhart → Pilchuck Pit; 1980-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Lenhart → Snohomish Rock Products; 1980-04-23 to current/open; source msha-controller-operator-history