# Relationship history for MSHA mine 1516661

Current hierarchy: **Morton Richard → Western Carbon Corp → Homestead #2**

- 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:** Western Carbon Corp → Homestead #2; 1989-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Morton Richard → Homestead #2; 1989-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morton Richard → Western Carbon Corp; 1989-06-01 to current/open; source msha-controller-operator-history