# Relationship history for MSHA mine 3003227

Current hierarchy: **Mark  Rundall → Tomark Inc → TOMARK INC.**

- 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:** Tomark Inc → TOMARK INC.; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Rundall → TOMARK INC.; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Rundall → Tomark Inc; 1998-07-01 to current/open; source msha-controller-operator-history