# Relationship history for MSHA mine 1901330

Current hierarchy: **John M Matteson; Steven E Goodman → Worcester Sand and Stone → J50 crusher 91668**

- 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

- **controller_controls_mine:** John M Matteson et al → J50 crusher 91668; 2020-01-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Worcester Sand and Stone → J50 crusher 91668; 2026-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M Matteson et al → Worcester Sand and Stone; 2026-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven E Goodman et al → Worcester Sand and Stone; 2026-03-13 to current/open; source msha-controller-operator-history