# Relationship history for MSHA mine 4103359

Current hierarchy: **Frank W  Marek → M & M Gravel Sales Inc → M & M Pit #4 & #5**

- 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:** M & M Gravel Sales Inc → M & M Pit #4 & #5; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank W  Marek → M & M Pit #4 & #5; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank W  Marek → M & M Gravel Sales Inc; 1986-01-01 to current/open; source msha-controller-operator-history