Gradients of portable ramps
- PMID: 2043869
- PMCID: PMC1669923
- DOI: 10.1136/bmj.302.6787.1277-b
Gradients of portable ramps
Comment on
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Ramps and rails.BMJ. 1991 Apr 20;302(6782):951-4. doi: 10.1136/bmj.302.6782.951. BMJ. 1991. PMID: 1827742 Free PMC article. Review. No abstract available.
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