# Relationship history for MSHA mine 2000806

Current hierarchy: **John A  Whitmore; Gary D  Whitmore; Rod W  Whitmore → B & W Sand-N-Stone LLC → B & W Sand-N-Stone LLC**

- 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:** P & B Gravel Company → B & W Sand-N-Stone LLC; 1950-01-01 to 1996-10-27; source msha-controller-operator-history
- **controller_controls_mine:** Earl R Bare → B & W Sand-N-Stone LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earl R Bare → P & B Gravel Company; 1950-01-01 to 1996-10-27; source msha-controller-operator-history
- **operator_operates_mine:** Martin Companies, Inc. → B & W Sand-N-Stone LLC; 1996-10-28 to 2008-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Grant D  Martin → B & W Sand-N-Stone LLC; 1996-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grant D  Martin → Martin Companies, Inc.; 1996-10-28 to 2008-06-26; source msha-controller-operator-history
- **operator_operates_mine:** B & W Sand-N-Stone LLC → B & W Sand-N-Stone LLC; 2008-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary D  Whitmore  et al → B & W Sand-N-Stone LLC; 2008-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary D  Whitmore  et al → B & W Sand-N-Stone LLC; 2008-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John A  Whitmore  et al → B & W Sand-N-Stone LLC; 2008-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rod W  Whitmore  et al → B & W Sand-N-Stone LLC; 2008-06-27 to current/open; source msha-controller-operator-history