# Relationship history for MSHA mine 4502678

Current hierarchy: **Paul J  Taylor; Jon M  Magnussen → Cascade Sand & Gravel → Cascade 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:** Cascade Sand & Gravel → Cascade Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jon M  Magnussen  et al → Cascade Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jon M  Magnussen  et al → Cascade Sand & Gravel; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Taylor  et al → Cascade Sand & Gravel; 1979-01-01 to current/open; source msha-controller-operator-history