# Relationship history for MSHA mine 1511076

Current hierarchy: **Crabtree Charles → Charles Crabtree Construction Company Inc → South Hill Surface**

- 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:** Crabtree Charles → South Hill Surface; 1977-04-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Charles Crabtree Construction Company Inc → South Hill Surface; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crabtree Charles → Charles Crabtree Construction Company Inc; 1978-02-01 to current/open; source msha-controller-operator-history