# Relationship history for MSHA mine 4502859

Current hierarchy: **Joe E  Black → Black'S Construction → Harrington Lagoon Pit**

- 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'S Construction → Harrington Lagoon Pit; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joe E  Black → Harrington Lagoon Pit; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe E  Black → Black'S Construction; 1980-09-01 to current/open; source msha-controller-operator-history