# Relationship history for MSHA mine 0700104

Current hierarchy: **Kenneth P  Adams; Joe Ann J Adams → M L Joseph Sand & Gravel Company Inc → M L Joseph Sand & Gravel Company Inc**

- 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:** M L Joseph Sand & Gravel Company Inc → M L Joseph Sand & Gravel Company Inc; 1991-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joe Ann J Adams et al → M L Joseph Sand & Gravel Company Inc; 1991-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe Ann J Adams et al → M L Joseph Sand & Gravel Company Inc; 1991-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth P  Adams et al → M L Joseph Sand & Gravel Company Inc; 1991-02-01 to current/open; source msha-controller-operator-history