# Relationship history for MSHA mine 1700233

Current hierarchy: **GCBH LLC → Gagne & Son Concrete Blocks, LLC → SAND & GRAVEL PIT**

- 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

- **operator_operates_mine:** Gagne & Son Concrete Blocks, LLC → SAND & GRAVEL PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Linda  Gagne et al → SAND & GRAVEL PIT; 1950-01-01 to 2021-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Linda  Gagne et al → Gagne & Son Concrete Blocks, LLC; 1950-01-01 to 2021-03-30; source msha-controller-operator-history
- **controller_controls_mine:** GCBH LLC → SAND & GRAVEL PIT; 2021-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GCBH LLC → Gagne & Son Concrete Blocks, LLC; 2021-03-31 to current/open; source msha-controller-operator-history