# Relationship history for MSHA mine 4503193

Current hierarchy: **Paul J  Taylor; Jon M  Magnussen → Cadman Concrete Company → B N 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

- **controller_controls_mine:** Paul J  Taylor  et al → B N Pit; 1986-06-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cadman Concrete Company → B N Pit; 1989-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Taylor  et al → Cadman Concrete Company; 1989-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jon M  Magnussen  et al → Cadman Concrete Company; 1989-04-01 to current/open; source msha-controller-operator-history