No.
Knob Insulators (cont'd)
Round Spit Knobs
Oval Knobs
Round Reversible Knobs
Square Reversible Split Knobs, Square Knobs, and Misc. Knobs
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R = round split knobs and round (standard diameter) nail knob (see Nail Knob Page 1)
RR = round reversible knob
O = oval
S = square or rectangular
SR = square or rectangular reversible knob
/ = marking on opposite side
// = marking on bottom
Patents for Knobs - Click on this link to see a list of all the knob patents.
| Category No. |
MARKING | Marking Type | Patent | Company | Notes | |
|---|---|---|---|---|---|---|
| Round Split Knobs | ||||||
| R-61 |
|
50 | emb | Davidson Porcelain Co. | 1-1/2" diameter | |
| R-143 |
|
8512 (underneath bottom) | emb | 1-1/2" diameter x 2" | ||
| R-165 |
|
9419 | r-e | 1-1/2" diameter x 2" | ||
| R-170 |
|
9419 (underneath bottom) | emb | 1-1/2" diameter x 1-7/8" | ||
| R-171 |
|
GECO / USA // CAT /9419 | emb | General Electric Co. | 1-1/2" diameter x 1-3/4" | |
| R-163 |
|
9420 (underneath bottom) | emb | 2" diameter x 2" | ||
| R-60 |
|
BRUNT | emb | Brunt Porcelain Co. | 2" diameter | |
| R-168 |
|
C.I.CO. | emb | Columbia Insulator Co. | 1-1/2" diameter x 1-1/2" tall | |
| R-46 |
|
D. P. CO // 9419 | emb | Davidson Porcelain Co. | 1-1/2" diameter | |
| R-20 |
|
F // F | emb | 464,770 | Findlay Electric Porcelain Co. | 1-3/8" diameter, caming groove |
| R-166 |
|
G. E. KNOB | emb | General Electric Co. | 1-15/16" diameter x 1-5/8" tall | |
| R-139 |
|
G. E. KNOB / PAT APLD FOR | emb | General Electric Co. | 1-1/2" diameter | |
| R-22 |
|
G. E. KNOB // CAT. 6580 | r-e | General Electric Co. | 2" diameter | |
| R-25 |
|
G. E. KNOB // CAT. 6580 | emb | General Electric Co. | 2" diameter | |
| R-167 |
|
G. E. KNOB / PAT APLD FOR // 9419 | emb | General Electric Co. | 1-1/2" diameter x 1-1/2" tall | |
| R-164 |
|
G. E. KNOB / PAT APLD FOR // 9419 | emb | General Electric Co. | 1-1/2" diameter x 1-7/8" tall | |
| R-21 |
|
G. E. KNOB / PAT APLD FOR // 9352 | emb | General Electric Co. | 1-1/2" diameter | |
| R-161 |
|
G. E. KNOB / PAT APLD FOR // 9420 | emb | General Electric Co. | '2" diameter x 2-1/4" tall | |
| R-144 |
|
G. E. KNOB // 9352 | r-e / emb | General Electric Co. | 1-1/2" diameter x 1-1/4" | |
| R-145 |
|
G. E. CO. // CAT / 9419 | emb | General Electric Co. | 1-1/2" diameter x 1-3/4"; matching vertical groove on the side | |
| R-140 |
|
G. E. KNOB // CAT. 9420 | r-e | General Electric Co. | 2" diameter x 2-1/8" | |
| R-47 |
|
G. E. KNOB // E P | emb / r-e | General Electric Co. | 1-1/2" diameter | |
| R-141 |
|
G P KNOB | emb | General Porcelain Co. | 2" diameter x 2-1/8"; matching vertical groove on the side | |
| R-142 |
|
MACOMB. | emb | Illinois Electric Porcelain Co. | 2-1/8" diameter x 2-1/8" | |
| R-23 |
|
P. P. Inc. | emb | Porcelain Products Inc. | 2" diameter; matching vertical groove on the side | |
| R-24 |
|
P. P. Inc. / 9420 // P. P. Inc. / 9420 | emb | Porcelain Products Inc. | 2" diameter; matching vertical groove on the side | |
| R-138 |
|
US // 9420 (underneath bottom) | r-e | U.S. Electric Porcelain Co. | 2" diameter | |
| R-162 |
|
US | r-e | U.S. Electric Porcelain Co. | 2" diameter | |
| Oval Knobs | ||||||
| O-01 |
|
N-N | Colonial Sign & Insulator Co. | similar to patent 806,588 | ||
| O-03 |
|
STAR // (embossed star) PAT DEC 5 05 | r-e / emb | 806,588 | Star Porcelain Co. | |
| O-04 |
|
(embossed star) // (r-e star) PAT APLD FOR | emb / R-E | 806,588 | Star Porcelain Co. | |
| O-02 |
|
T / PAT / 4803 / NO. 5½ | emb | 697,001 | R. Thomas & Sons Co. | reversible, oval; error date, should be 4-8-02 |
| Round Reversible Knobs | ||||||
| RR-01 |
|
.G. PAT APPD FOR (circle) | emb | 1-1/8" diameter; reversible | ||
| RR-09 |
|
B&D PAT. / AUG. 13, 95 | emb | 544,501 | Buffinton & Dow patent (licensed) | 1-1/2" diameter; reversible; cleat patent |
| RR-02 | |
BUCKEYE REGD (circle) PATD 12-31-12 / F (outer circle) | emb | 1,048,850 | Findlay Electric Porcelain Co. | reversible, crossover knob |
| RR-06 | |
F / PATD / 12-31 / 12 (in circle) | emb | 1,048,850 | Findlay Electric Porcelain Co. | 1-1/8" diameter; reversible |
| RR-07 |
|
F / PATD / 12-31 / 12 (in circle) | emb | 1,048,850 | Findlay Electric Porcelain Co. | 1-1/4" diameter; reversible, crossover knob; error date 12-13 instead of 12-31 |
| RR-10 |
|
O. P. / CO. / NO. 1 // PAT. / APR. 8 03 | emb | 697,001 | Ohio Porcelain Co. | 1-3/8" diameter; reversible |
| RR-05 | |
PAT. / APP.D. / FOR / G. (in circle, G inside circle) | emb | 1-1/8" diameter; reversible | ||
| RR-11 |
|
PATD / 24 / 085 / 1611 (circle) | emb | 992,570 | 1-1/8" diameter; reversible | |
| RR-04 | |
T / PATD 7-20 / 1915 | emb | 1,147,498 | Trenton Porcelain Co. | 1-1/8" diameter; reversible |
| RR-03 | |
T P I / NO 1 / T / PAT / APR / 803 | emb | 697,001 | R. Thomas & Sons Co. | 1-3/8" diameter, reversible, error date, should be 4-8-02 |
| RR-08 |
|
T P I / NO 2 / THOMAS / PAT / APR / 8 03 | emb | 697,001 | R. Thomas & Sons Co. | 1-3/4" diameter; reversible |
| Square Reversible Split Knobs, Square Knobs, and Misc. Knobs | ||||||
| SR-01 |
|
U S / PATD / 2408 / 5 16 11 | emb | 992,570 | US Electric Porcelain Co. | reversible; 1-1/8" x 1-5/8" tall |
| SR-02 |
|
Triangle M / PAT'D / FEB 9 / 1915 | emb | 1,127,776 | Illinois Electric Porcelain Co. | reversible; 1-1/4" x 1-3/4" |
| SR-03 |
|
PAT'D / U S (on short end) | emb | 992,570 | US Electric Porcelain Co. | reversible; 1" x 1-3/4" tall |
| SR-04 |
|
U S / PAT'D (on long end) | emb | 992,570 | US Electric Porcelain Co. | reversible (found at General Porcelain Co. site); 1-1/8" x 1-5/8" |
| SR-05 |
|
O P / CO | emb | Ohio Porcelain Co. | reversible; 1" x 1-3/4" tall | |
| SR-06 |
|
PATD / 12-31-12 // BUCKEYE / REGD | emb | 1,048,850 | Findlay Electric Porcelain Co. | reversible; 1-1/8 x 1-7/8 tall |
| SR-07 |
|
PAT'D / E | emb | 992,570 | East Liverpool Electrical Porcelain Co. | reversible; 1-1/8" x 1-5/8" |
| SR-08 |
|
AMERICAN / PAT APL'D | emb | 1,177,996 | Adamant Porcelain Co. | reversible; 1-1/8" x 1-3/4" |
| S-03 |
|
MACOMB. / PAT. / MAR-1-04 // S-H. co. / No. 1. | r-e | 753,399 | Illinois Electric Porcelain Co. | Snyder-Hunt Co. |
| S-04 |
|
S H co. / no 1. // MACOMB. / PAT. / MAR-1-04 | r-e | 753,399 | Illinois Electric Porcelain Co. | Snyder-Hunt Co. |
| S-01 |
|
S-H Co. / No. 1 // A. P. C. L. / Pat. / Mar. 1, '04 | emb | 753,399 | Adamant Porcelain Co. Ltd. | Snyder-Hunt Co. |
| S-02 |
|
S-H Co. / No. 1 // MACOMB / PAT / MAR-1-04 | r-e | 753,399 | Illinois Electric Porcelain Co. | Snyder-Hunt Co. |
| S-05 |
|
Triangle M / PARALLEL / KNOB / PAT. APPL. FOR // E. L. KLINGEL / ST. PAUL | emb / r-e | 2,307,277 | Illinois Electric Porcelain Co. |
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