# Relationship history for MSHA mine 1202505

Current hierarchy: **John  Steckling → INDIANA QUARRIES & CARVERS → ROOT QUARRY**

- 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:** Michael  Stigler et al → ROOT QUARRY; 2012-04-24 to 2026-02-17; source msha-controller-operator-history
- **operator_operates_mine:** INDIANA QUARRIES & CARVERS → ROOT QUARRY; 2021-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Stigler et al → INDIANA QUARRIES & CARVERS; 2021-04-07 to 2026-02-17; source msha-controller-operator-history
- **controller_controls_operator:** John  Steckling et al → INDIANA QUARRIES & CARVERS; 2021-04-07 to 2026-02-17; source msha-controller-operator-history
- **controller_controls_mine:** John  Steckling → ROOT QUARRY; 2026-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Steckling → INDIANA QUARRIES & CARVERS; 2026-02-18 to current/open; source msha-controller-operator-history