# Relationship history for MSHA mine 4202235

Current hierarchy: **Robbie  Palmer; Rick  Palmer; Derrick  Jones → Adobe Rock Products LLC → Adobe Rock -Erda Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Palmer Trucking → Adobe Rock -Erda Pit; 1999-03-01 to 1999-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Brett  Palmer → Adobe Rock -Erda Pit; 1999-03-01 to 1999-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Brett  Palmer → Palmer Trucking; 1999-03-01 to 1999-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Adobe Rock Products LLC → Adobe Rock -Erda Pit; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J D  Palmer → Adobe Rock -Erda Pit; 1999-04-01 to 2019-09-18; source msha-controller-operator-history
- **controller_controls_operator:** J D  Palmer → Adobe Rock Products LLC; 1999-04-01 to 2019-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Robbie  Palmer et al → Adobe Rock -Erda Pit; 2019-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robbie  Palmer et al → Adobe Rock Products LLC; 2019-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derrick  Jones et al → Adobe Rock Products LLC; 2019-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Palmer et al → Adobe Rock Products LLC; 2019-09-19 to current/open; source msha-controller-operator-history