# Relationship history for MSHA mine 1700709

Current hierarchy: **John  Work → F.C. Work & Sons Inc. → TALTY 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** F.C. Work & Sons Inc. → TALTY PIT; 2001-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Work → TALTY PIT; 2001-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Work → F.C. Work & Sons Inc.; 2001-07-31 to current/open; source msha-controller-operator-history