# Relationship history for MSHA mine 4502118

Current hierarchy: **Donald  Taylor → Olson & Taylor Inc → 700 Road Vista 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:** City Of Seattle Water Shed → 700 Road Vista Pit; 1950-01-01 to 1980-08-04; source msha-controller-operator-history
- **controller_controls_mine:** City Of Seattle → 700 Road Vista Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** City Of Seattle → City Of Seattle Water Shed; 1950-01-01 to 1980-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Taylor → 700 Road Vista Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Olson & Taylor Inc → 700 Road Vista Pit; 1980-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Taylor → Olson & Taylor Inc; 1980-08-05 to current/open; source msha-controller-operator-history