6BQ5 ID? pics incl.

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I dug out some 6BQ5s today that I don't recognize. Unfortunately, all four are void of any print, except the tube designation and the etched codes along the bottom.
The tubes have 4 seams across the top.
Does anyone recognize this code:
MIF
L4J2
MIF
L6A2

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Edits: 09/08/15

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Topic - 6BQ5 ID? pics incl. - Byrd69 14:25:58 09/08/15 (6)

EL86 - MBLE Mazda Brussels Belgium - CV4109 18:34:58 09/08/15 (0)

RE: might not be a 6BQ5 nt - DAK 16:16:30 09/08/15 (4)

Yeah, 7 pins, not 9. - FenderLover 16:21:22 09/08/15 (3)

RE: Yeah, 7 pins, not 9. - Byrd69 18:18:45 09/08/15 (1)

RE: Yeah, 7 pins, not 9. - FenderLover 18:48:51 09/08/15 (0)

RE: Yeah, 7 pins, not 9. - Eli Duttman 17:00:06 09/08/15 (0)

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