# Relationship history for MSHA mine 4201549

Current hierarchy: **Perkins Larry Company → Larry Perkins Company → Marshbank Mine**

- 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:** Larry Perkins Company → Marshbank Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Perkins Larry Company → Marshbank Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Perkins Larry Company → Larry Perkins Company; 1979-01-01 to current/open; source msha-controller-operator-history