# Relationship history for MSHA mine 4104020

Current hierarchy: **Scott M S → M S Scott Sand & Gravel → C&S SAND & GRAVEL**

- 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 & S Sand & Gravel → C&S SAND & GRAVEL; 1998-07-01 to 1999-07-06; source msha-controller-operator-history
- **controller_controls_mine:** Craig Brad → C&S SAND & GRAVEL; 1998-07-01 to 1999-07-06; source msha-controller-operator-history
- **controller_controls_operator:** Craig Brad → C & S Sand & Gravel; 1998-07-01 to 1999-07-06; source msha-controller-operator-history
- **operator_operates_mine:** M S Scott Sand & Gravel → C&S SAND & GRAVEL; 1999-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott M S → C&S SAND & GRAVEL; 1999-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott M S → M S Scott Sand & Gravel; 1999-07-07 to current/open; source msha-controller-operator-history