# Relationship history for MSHA mine 2002560

Current hierarchy: **Catherine  Gildner; Gregory  Gildner → Cheboygan Cement Products Inc → WASH PLANT**

- 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:** Cheboygan Cement Products Inc → WASH PLANT; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Veronica  Gildner → WASH PLANT; 1980-06-01 to 2012-07-04; source msha-controller-operator-history
- **controller_controls_operator:** Veronica  Gildner → Cheboygan Cement Products Inc; 1980-06-01 to 2012-07-04; source msha-controller-operator-history
- **controller_controls_mine:** Gregory  Gildner et al → WASH PLANT; 2012-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregory  Gildner et al → Cheboygan Cement Products Inc; 2012-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Catherine  Gildner et al → Cheboygan Cement Products Inc; 2012-07-05 to current/open; source msha-controller-operator-history