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Graph recording test on mines rescue apparatus
Graph drawn in black ink on yellow lined graph paper. Full title: 'Duration of Absorbent / Practical Test with Mines Rescue Apparatus - Nov. 1937. / Weight of Absorbent = 4½ Lbs.' Documents 88.98I/7 - 9 were originally contained within an acidic card document file.
Collection Area
Industry
Item Number
88.98I/8
Measurements
unfolded
(mm): 452
unfolded
(mm): 590
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