# Relationship history for MSHA mine 4608978

Current hierarchy: **William J  Salerno → Bingamon Corp → Blue Grass**

- 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:** Bingamon Corp → Blue Grass; 2003-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William J  Salerno → Blue Grass; 2003-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J  Salerno → Bingamon Corp; 2003-01-15 to current/open; source msha-controller-operator-history