# Relationship history for MSHA mine 3608481

Current hierarchy: **Tammy L  Kijowski; Frank S  Schall → Planet Mining Inc → Knapp Mine**

- 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

- **controller_controls_mine:** Frank S  Schall  et al → Knapp Mine; 1990-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Planet Mining Inc → Knapp Mine; 1994-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank S  Schall  et al → Planet Mining Inc; 1994-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tammy L  Kijowski  et al → Planet Mining Inc; 1994-08-01 to current/open; source msha-controller-operator-history