# Relationship history for MSHA mine 2402141

Current hierarchy: **William J  Hollow → Hollow Contracting Inc → PUG MILL**

- 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:** William J  Hollow → PUG MILL; 1992-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Montana Materials LLC → PUG MILL; 1995-04-11 to 1998-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Montana Materials Llc → PUG MILL; 1998-05-01 to 1998-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Montana Materials LLC → Montana Materials Llc; 1998-05-01 to 1998-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Hollow Contracting Inc → PUG MILL; 1998-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J  Hollow → Hollow Contracting Inc; 1998-05-15 to current/open; source msha-controller-operator-history