# Relationship history for MSHA mine 4503709

Current hierarchy: **Pamp  Maiers → AAA Readymix Inc → WP3**

- 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

- **controller_controls_mine:** Pamp  Maiers → WP3; 2007-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roland L  Chipman → WP3; 2009-06-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Apple Valley Sand and Gravel → WP3; 2012-07-27 to 2015-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Roland L  Chipman → Apple Valley Sand and Gravel; 2012-07-27 to 2015-10-05; source msha-controller-operator-history
- **operator_operates_mine:** AAA Readymix Inc → WP3; 2015-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pamp  Maiers → AAA Readymix Inc; 2015-10-06 to current/open; source msha-controller-operator-history