# Relationship history for MSHA mine 2002879

Current hierarchy: **Gregory J  Sherwood; Andrew A  Willbee → G & A Sand & Gravel LLC → G & A Sand & Gravel, L.L.C**

- 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:** Jackson Asphalt Company → G & A Sand & Gravel, L.L.C; 1992-06-01 to 2007-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Risner → G & A Sand & Gravel, L.L.C; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Risner → Jackson Asphalt Company; 1992-06-01 to 2007-04-15; source msha-controller-operator-history
- **operator_operates_mine:** G & A Sand & Gravel LLC → G & A Sand & Gravel, L.L.C; 2007-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gregory J  Sherwood et al → G & A Sand & Gravel, L.L.C; 2007-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregory J  Sherwood et al → G & A Sand & Gravel LLC; 2007-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew A  Willbee et al → G & A Sand & Gravel LLC; 2007-04-16 to current/open; source msha-controller-operator-history