# Relationship history for MSHA mine 3503736

Current hierarchy: **Pamp  Maiers → North Central Construction, Inc. → Portable Crusher #5**

- 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 → Portable Crusher #5; 1984-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adam  Schatz → Portable Crusher #5; 2001-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** AJ Crushing → Portable Crusher #5; 2010-02-18 to 2014-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Adam  Schatz → AJ Crushing; 2010-02-18 to 2014-09-08; source msha-controller-operator-history
- **operator_operates_mine:** North Central Construction, Inc. → Portable Crusher #5; 2014-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pamp  Maiers → North Central Construction, Inc.; 2014-09-09 to current/open; source msha-controller-operator-history