# Relationship history for MSHA mine 3303688

Current hierarchy: **Knott Joe → Salt Creek Corp → Dundee Strip**

- 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:** Salt Creek Corp → Dundee Strip; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Knott Joe → Dundee Strip; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knott Joe → Salt Creek Corp; 1978-04-01 to current/open; source msha-controller-operator-history