# Relationship history for MSHA mine 4202149

Current hierarchy: **Buck Riley  Butters → Bedrock Sand and Gravel → Bedrock**

- 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:** C E Butters Realty & Construction → Bedrock; 1996-09-01 to 2023-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Kent  Butters → Bedrock; 1996-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kent  Butters → C E Butters Realty & Construction; 1996-09-01 to 2023-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Bedrock Sand and Gravel → Bedrock; 2023-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Buck Riley  Butters → Bedrock; 2023-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buck Riley  Butters → Bedrock Sand and Gravel; 2023-10-01 to current/open; source msha-controller-operator-history