# Relationship history for MSHA mine 1513373

Current hierarchy: **Carper Lovell & Carl → Carper Brothers Coal → No 1 Surface 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:** Carper Brothers Coal → No 1 Surface Mine; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carper Lovell & Carl Et Al → No 1 Surface Mine; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carper Lovell & Carl Et Al → Carper Brothers Coal; 1982-03-01 to current/open; source msha-controller-operator-history