# Relationship history for MSHA mine 0102504

Current hierarchy: **Fullenwider Travis → F & M Gravel Company → Pit No 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Pine Flat Gravel Company Inc → Pit No 1; 1981-09-01 to 1984-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Mercer D C → Pit No 1; 1981-09-01 to 1984-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Mercer D C → Pine Flat Gravel Company Inc; 1981-09-01 to 1984-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Pine Flat Gravel Company Inc → Pit No 1; 1984-09-21 to 1986-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Allen Randy E → Pit No 1; 1984-09-21 to 1986-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Allen Randy E → Pine Flat Gravel Company Inc; 1984-09-21 to 1986-02-12; source msha-controller-operator-history
- **operator_operates_mine:** F & M Gravel Company → Pit No 1; 1986-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fullenwider Travis Et Al → Pit No 1; 1986-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fullenwider Travis Et Al → F & M Gravel Company; 1986-02-13 to current/open; source msha-controller-operator-history