# Relationship history for MSHA mine 3600173

Current hierarchy: **Glasgow Inc → Glasgow Inc → Montgomery Stone**

- 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:** Glasgow Inc → Montgomery Stone; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Montgomery Stone Company → Montgomery Stone; 1950-01-01 to 1985-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Mc Glynn William F → Montgomery Stone; 1950-01-01 to 1985-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Mc Glynn William F → Montgomery Stone Company; 1950-01-01 to 1985-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Glasgow Inc → Montgomery Stone; 1985-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glasgow Inc → Glasgow Inc; 1985-05-06 to current/open; source msha-controller-operator-history