# Relationship history for MSHA mine 3605643

Current hierarchy: **Anthony J  Williams; Robert D  Williams → Williams & Sons Slate & Tile Inc → Williams & Sons Slate & Tile**

- 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:** Williams & Sons Slate & Tile Inc → Williams & Sons Slate & Tile; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert D  Williams et al → Williams & Sons Slate & Tile; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert D  Williams et al → Williams & Sons Slate & Tile Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony J  Williams et al → Williams & Sons Slate & Tile Inc; 1950-01-01 to current/open; source msha-controller-operator-history