The backrest should offer firm support, especially in the lumbar (lower back) region, should be [...] inches wide, and should be easily adjustable both in angle and height, while sitting. The optimum angle between seat and back should permit a working posture of at least 90 degrees between the spine and thighs.
Answer
12- 19
Question
The backrest should offer firm support, especially in the lumbar (lower back) region, should be [...] inches wide, and should be easily adjustable both in angle and height, while sitting. The optimum angle between seat and back should permit a working posture of at least 90 degrees between the spine and thighs.
Answer
?
Question
The backrest should offer firm support, especially in the lumbar (lower back) region, should be [...] inches wide, and should be easily adjustable both in angle and height, while sitting. The optimum angle between seat and back should permit a working posture of at least 90 degrees between the spine and thighs.
Answer
12- 19
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Open it The backrest should offer firm support, especially in the lumbar (lower back) region, should be 12- 19 inches wide, and should be easily adjustable both in angle and height, while sitting. The optimum angle between seat and back should permit a working posture of at least 90 degrees betw