# Relationship history for MSHA mine 1511219

Current hierarchy: **Van Dyke David → Century Coal Enterprises → Century No 2 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:** Van Dyke David → Century No 2 Surface; 1977-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Century Coal Enterprises → Century No 2 Surface; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Van Dyke David → Century Coal Enterprises; 1978-04-01 to current/open; source msha-controller-operator-history