Hints for the improvement of trusses; intended to render their use less inconvenient, and to prevent the necessity of an understrap. With the description of a truss of easy construction and slight expence [sic], for the use of labouring poor / [James Parkinson].

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Hints for the improvement of trusses; intended to render their use less inconvenient, and to prevent the necessity of an understrap. With the description of a truss of easy construction and slight expence [sic], for the use of labouring poor / [James Parkinson]. Credit: Wellcome Collection. Public Domain Mark