# Relationship history for MSHA mine 1101163

Current hierarchy: **Greg  Kabbes; Richard  Kabbes → Mattoon Sand & Gravel Company → Mattoon Sand & Gravel Company**

- 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:** Mattoon Sand & Gravel → Mattoon Sand & Gravel Company; 1950-01-01 to 1988-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Delbert  Diepholz et al → Mattoon Sand & Gravel Company; 1950-01-01 to 1988-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Delbert  Diepholz et al → Mattoon Sand & Gravel; 1950-01-01 to 1988-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Mattoon Sand & Gravel Company → Mattoon Sand & Gravel Company; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Kabbes et al → Mattoon Sand & Gravel Company; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Kabbes et al → Mattoon Sand & Gravel Company; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Kabbes et al → Mattoon Sand & Gravel Company; 1988-06-14 to current/open; source msha-controller-operator-history