# Relationship history for MSHA mine 0600511

Current hierarchy: **Herbert W Holden Jr → Holden Earth Products, Inc. → Lisbon Pit & Plant**

- 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:** Janowicz Sand & Gravel Company → Lisbon Pit & Plant; 1950-01-01 to 2023-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Janowicz Charles → Lisbon Pit & Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janowicz Charles → Janowicz Sand & Gravel Company; 1950-01-01 to 2023-08-21; source msha-controller-operator-history
- **operator_operates_mine:** Holden Earth Products, Inc. → Lisbon Pit & Plant; 2023-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Herbert W Holden Jr → Lisbon Pit & Plant; 2023-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Herbert W Holden Jr → Holden Earth Products, Inc.; 2023-08-22 to current/open; source msha-controller-operator-history