Hyperbolic Match Output

Number:90

Maker:RICOH (Japan San - Ai Group)

Model:No. 158

Scales Front: || Sh₂, Sh₁, Th, A || BI, S, T, CI, C || D, DI, LL₃, LL₂, LL₁ ||

Scales Back: || X₂, X₁, P₂, P₁ || Q, Y, L, L^X, I || I, L^θ₁ & L^θ₁,L^θ₂ & L^θ₂ , L^Y ||

Gauge Marks:

Cursor Front:

Cursor Back:

Construction:

Date:

Source: D.D.

Information: Note: Is similar to Relay No. 158. Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.