c. 1836
US Patent No. 98

1836 US98 Patent Knobs with Sulfide

c. 1830s
US Patent No. 98

US 98 Patent Knobs

c. 1830s
US Patent No. 65

US 65 Patent Knobs

1837
US Patent No. 434

US 434 Patent Model

c. 1840
US Patent No. 434

Black Glass Cabinet Knob

c. 1853
US Patent No. 434

Silvered Glass Door Knob

With Blind Mount

c. 1883
US Patent No. 278,704

William F. Hall Patent Knob

c. 1890

Blue Glass Door Knob

c. 1950s

1179 Ebony and Lucite Knobs

c. 1962

Modern Knob Display VR 662