# Relationship history for MSHA mine 3200767

Current hierarchy: **Richard A  Kresse → Kresse Gravel → Pit 1**

- 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:** Kresse & Christl Gravel → Pit 1; 1998-07-01 to 2016-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Christl et al → Pit 1; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Christl et al → Kresse & Christl Gravel; 1998-07-01 to 2016-05-03; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Kresse et al → Kresse & Christl Gravel; 1998-07-01 to 2016-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Kresse Gravel → Pit 1; 2016-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard A  Kresse → Pit 1; 2016-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Kresse → Kresse Gravel; 2016-05-04 to current/open; source msha-controller-operator-history