Jiqi guntong yao jia baoxiandang
'Machinery with rolling tubes must have safety crosspieces.' Title of series: 'Mining safety and health hanging charts.'
| Institution: | International Institute of Social History |
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| Format: | IMAGE |
| Subjects: | |
| Online Access: | http://hdl.handle.net/10622/3BA29757-4DCD-444A-9878-0540CBE54560 |
| Summary: | 'Machinery with rolling tubes must have safety crosspieces.' Title of series: 'Mining safety and health hanging charts.' |
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