# Relationship history for MSHA mine 2301845

Current hierarchy: **John R  Malloy → Iron Mountain Trap Rock Company → Pilot Knob Trap Rock Mill**

- 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:** John R  Malloy → Pilot Knob Trap Rock Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Iron Mountain Trap Rock Company → Pilot Knob Trap Rock Mill; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Malloy → Iron Mountain Trap Rock Company; 1981-06-01 to current/open; source msha-controller-operator-history