# Relationship history for MSHA mine 3401995

Current hierarchy: **Marion (Hoss)  Deleplank → Last Chance Stone → Last Chance Stone**

- 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:** Stone Ridge Quarry → Last Chance Stone; 2006-03-01 to 2014-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Richie  Perkins → Last Chance Stone; 2006-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richie  Perkins → Stone Ridge Quarry; 2006-03-01 to 2014-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Last Chance Stone → Last Chance Stone; 2014-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marion (Hoss)  Deleplank → Last Chance Stone; 2014-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marion (Hoss)  Deleplank → Last Chance Stone; 2014-04-01 to current/open; source msha-controller-operator-history