# Relationship history for MSHA mine 1601513

Current hierarchy: **Jean Kass  Connick; Mamie  Kass → Kass Bros., Inc. → Equipment Shop**

- 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:** Mamie  Kass et al → Equipment Shop; 1999-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kass Bros., Inc. → Equipment Shop; 2011-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mamie  Kass et al → Kass Bros., Inc.; 2011-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jean Kass  Connick et al → Kass Bros., Inc.; 2011-04-12 to current/open; source msha-controller-operator-history