# Relationship history for MSHA mine 3600207

Current hierarchy: **William T HIll → Penn Slate, Inc → Manhattan Quarry - Penn Slate**

- 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:** Penn Big Bed Slate Company Inc → Manhattan Quarry - Penn Slate; 1950-01-01 to 2022-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Peter J  Papay Sr et al → Manhattan Quarry - Penn Slate; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter J  Papay Sr et al → Penn Big Bed Slate Company Inc; 1950-01-01 to 2022-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Penn Slate, Inc → Manhattan Quarry - Penn Slate; 2022-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William T HIll → Manhattan Quarry - Penn Slate; 2022-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William T HIll → Penn Slate, Inc; 2022-08-01 to current/open; source msha-controller-operator-history