# Relationship history for MSHA mine 2301980

Current hierarchy: **John R  Malloy → Iron Mountain Trap Rock Company → Graniteville Quarry**

- 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:** John R  Malloy → Graniteville Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Iron Mountain Trap Rock Company → Graniteville Quarry; 1988-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Malloy → Iron Mountain Trap Rock Company; 1988-02-01 to current/open; source msha-controller-operator-history