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This Japanese Industrial Standard specifies the cylindrical squares made of cast iron and steel to be used mainly for the measurement of perpendicularity.
| Author | JSA |
|---|---|
| Editor | JSA |
| Document type | Standard |
| Format | File |
| Confirmation date | 2016-10-20 |
| ICS | 17.040.01 : Linear and angular measurements in general |
| Number of pages | 4 |
| Year | 1970 |
| Document history | |
| Country | Japan |
| Keyword | JIS 7539;7539;JIS B 7539-1971 |