# Relationship history for MSHA mine 3601433

Current hierarchy: **Mase Richard D → Antrim Mining Incorported → Antrim Strip #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Percival John P Et Al → Antrim Strip #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P & M Mining Company → Antrim Strip #1; 1972-02-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Percival John P Et Al → P & M Mining Company; 1972-02-01 to 1979-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Antrim Mining Incorported → Antrim Strip #1; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mase Richard D → Antrim Strip #1; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mase Richard D → Antrim Mining Incorported; 1979-10-01 to current/open; source msha-controller-operator-history