SANS 178:1983*SABS ISO 1524:1983 (1994-03-03) * DIN EN 21524 (1991-09), IDT * DIN ISO 1524 (1987-06), IDT * NBN EN 21524 (1992), IDT * BS 3900-C6 (1983-12-30), IDT * EN 21524 (1991-08), IDT * prEN 21524 (1990-12), IDT * EN 21524 (1992), IDT * EN 21524 (1992), IDT * NF T30-046 (1970-12-01), MOD * NF T30-046 (1991-11-01), IDT * UNI EN 21524 (1992), IDT * JIS K 5400 (1990-02-01), MOD * JIS K 5600-2-5 (1999-04-20), IDT * OENORM EN 21524 (1992-08-01), IDT * SS-ISO 1524 (1989-04-26), IDT * SS-EN 21524 (1991-12-04), IDT * SS 184113 (1986-12-03), IDT * UNE-EN 21524 (1993-01-22), IDT * AMD 6910, IDT * Corrigendum on NEN-ISO 1524, IDT * DS/ISO 1524 (1984), IDT * ELOT 469 (1982), IDT * IST L 215 (1991), IDT * NBN T 22-106 (1984), IDT * NEN-ISO 1524 (1988), IDT * NS-ISO 1524 (1991), IDT * SFS-EN 21524 (1991), IDT * SFS-ISO 1524 (1984), IDT * STN EN 21524 (2000-06-01), IDT * NEN-ISO 1524:1988 nl (1988-09-01), IDT * NEN-ISO 1524:1988/C1:1991 nl (1991-09-01), IDT * SABS ISO 1524:1983 (1994-03-03), IDT