# Relationship history for MSHA mine 5001656

Current hierarchy: **Colas S A → SERB → North Operations-Crusher #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Southeast Road Builders → North Operations-Crusher #1; 1999-10-01 to 2018-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Roger  Schnabel → North Operations-Crusher #1; 1999-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Schnabel → Southeast Road Builders; 1999-10-01 to 2018-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → North Operations-Crusher #1; 2018-03-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SERB → North Operations-Crusher #1; 2018-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → SERB; 2018-04-01 to current/open; source msha-controller-operator-history