1. Mannheim type single sided student rule.
2. This rule has had some serious abuse in it's past. I acquired it as part of a lot of other rules and this one was thrown in as the owner was going to dispose of it. The only reason I have added it to the collection is because of the yellow base colour of the rule. This is an attempt to cash in on the "Eye-Saver" yellow of the Pickett range of rules.
3. Refer to Acu-Math 400 (1) for the more traditionally coloured white rule.

Brand	ACU-MATH
Model	No. 400
Country of Manufacture	USA
Scales Front	S, K, A [B, CI, C] D, L, T
Scales Back
Number of Scales	9
Slide Rule Materials	Plastic
Cursor Materials	Plastic
Cursor Lines	1 Front
Scale Length	25 cm
Length	31.4 cm
Width	3.9 cm
Condition	Poor, This rule has suffered some serious abuse and has been re-glued together. It also has serious marks scratched into the face.
Documentation	None
Accessories	Vinyl Case