# Relationship history for MSHA mine 4202077

Current hierarchy: **Karen  Palmer → Diamond K Gypsum Inc → Chalk Hills 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

- **operator_operates_mine:** Diamond K Gypsum Inc → Chalk Hills Quarry; 1992-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Karen  Palmer → Chalk Hills Quarry; 1992-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karen  Palmer → Diamond K Gypsum Inc; 1992-03-01 to current/open; source msha-controller-operator-history