# Relationship history for MSHA mine 1302253

Current hierarchy: **Wayne H  Krug → Gypsum AG Supply → Gypsum AG Supply**

- 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:** Quarry Services Inc → Gypsum AG Supply; 2000-11-01 to 2018-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Steve M  Molstad et al → Gypsum AG Supply; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve M  Molstad et al → Quarry Services Inc; 2000-11-01 to 2018-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Wayne H  Krug et al → Quarry Services Inc; 2000-11-01 to 2018-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Gypsum AG Supply → Gypsum AG Supply; 2018-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wayne H  Krug → Gypsum AG Supply; 2018-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne H  Krug → Gypsum AG Supply; 2018-07-01 to current/open; source msha-controller-operator-history