# Relationship history for MSHA mine 2700302

Current hierarchy: **Warren  Colby; Marc  Bourgeois → GMI Acquisition LLC → Boscawen Sand & Gravel North**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** R D Edmunds & Sons Inc → Boscawen Sand & Gravel North; 1993-08-01 to 2016-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard D  Edmunds → Boscawen Sand & Gravel North; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard D  Edmunds → R D Edmunds & Sons Inc; 1993-08-01 to 2016-10-31; source msha-controller-operator-history
- **operator_operates_mine:** GMI Acquisition LLC → Boscawen Sand & Gravel North; 2016-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marc  Bourgeois et al → Boscawen Sand & Gravel North; 2016-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marc  Bourgeois et al → GMI Acquisition LLC; 2016-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren  Colby et al → GMI Acquisition LLC; 2016-11-01 to current/open; source msha-controller-operator-history