# Relationship history for MSHA mine 4103274

Current hierarchy: **Hall Gerald J → Sand Pit → Sand 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:** Santa Fe Sand & Gravel → Sand Pit; 1984-12-01 to 1986-10-22; source msha-controller-operator-history
- **controller_controls_mine:** Hall Gerald J → Sand Pit; 1984-12-01 to 1986-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Hall Gerald J → Santa Fe Sand & Gravel; 1984-12-01 to 1986-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Cccs Business Services Inc → Sand Pit; 1986-10-23 to 1988-01-12; source msha-controller-operator-history
- **controller_controls_mine:** Hall Elizabeth N → Sand Pit; 1986-10-23 to 1988-01-12; source msha-controller-operator-history
- **controller_controls_operator:** Hall Elizabeth N → Cccs Business Services Inc; 1986-10-23 to 1988-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Sand Pit → Sand Pit; 1988-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Gerald J → Sand Pit; 1988-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Gerald J → Sand Pit; 1988-01-13 to current/open; source msha-controller-operator-history