# Relationship history for MSHA mine 4502011

Current hierarchy: **Martin  Ruiter → Martin's Feed, Inc. → Blockhouse Butte Mine**

- 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:** D M Layman Inc → Blockhouse Butte Mine; 1950-01-01 to 2013-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Ed  Layman → Blockhouse Butte Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ed  Layman → D M Layman Inc; 1950-01-01 to 2013-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Martin's Feed, Inc. → Blockhouse Butte Mine; 2013-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin  Ruiter → Blockhouse Butte Mine; 2013-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin  Ruiter → Martin's Feed, Inc.; 2013-08-15 to current/open; source msha-controller-operator-history