# Relationship history for MSHA mine 2401411

Current hierarchy: **Graphite Sales Inc → United Minerals Company → Black Diamond Graphite 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:** Black Diamond Graphite Company → Black Diamond Graphite Mine; 1978-03-09 to 1982-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Black Diamond Graphite Company → Black Diamond Graphite Mine; 1978-03-09 to 1982-03-15; source msha-controller-operator-history
- **controller_controls_operator:** Black Diamond Graphite Company → Black Diamond Graphite Company; 1978-03-09 to 1982-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Graphite Sales Inc → Black Diamond Graphite Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** United Minerals Company → Black Diamond Graphite Mine; 1982-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graphite Sales Inc → United Minerals Company; 1982-03-16 to current/open; source msha-controller-operator-history