# Relationship history for MSHA mine 3402044

Current hierarchy: **Philip J  Schwarz Et At; Gene J  Schwarz → SCHWARZ SAND, LLC → Post Operation**

- 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

- **controller_controls_mine:** Philip J  Schwarz Et At → Post Operation; 2000-02-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BCM Oklahoma LLC → Post Operation; 2007-08-21 to 2013-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Boral Limited → Post Operation; 2007-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boral Limited → BCM Oklahoma LLC; 2007-08-21 to 2013-06-30; source msha-controller-operator-history
- **operator_operates_mine:** SCHWARZ SAND, LLC → Post Operation; 2013-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip J  Schwarz Et At → SCHWARZ SAND, LLC; 2013-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gene J  Schwarz Et Al → SCHWARZ SAND, LLC; 2013-07-01 to current/open; source msha-controller-operator-history