GG-T-671 Revision F, March 10, 1981
TRIANGLES, DRAFTING: LINE GUIDES, LETTERING, ADJUSTABLE AND NONADJUSTABLE (GENERAL SPECIFICATION)
Includes all amendments and changes through Cancellation Notice 1, May 4, 2000
Additional Comments: CNCL NO S/S
This specification covers the general requirements for plastic or steel triangles and plastic lettering line guides.
Triangles and line guides shall be of the following types, as specified (see 6.2), and in accordance with the applicable specification sheets (see 2.1):
Type I - Triangles drafting, plastic, transparent. Type II - Triangles, line guide, lettering, nonadjustable, plastic. Type III - Triangles, drafting, adjustable, plastic. Type IV - Triangles, drafting, steel, open center. Type V - Triangles, drafting, steel, bead supports and lifting knob. Type VI - Line guide, lettering, adjustable, plastic.